We start with a surprising idea borrowed from engineering, a 1949 mathematical proof about how often you need to measure something to actually see it, and I show you why fasting glucose samples your body thousands of times too slowly. Those after-meal spikes, called postprandial glucose, are where the early warning signs of insulin resistance and prediabetes quietly show up first, often years before your fasting number ever moves. Even people with completely normal labs can spend three or more hours a day with blood sugar above 140. Then I walk you through the fuller picture you’re allowed to ask your doctor for, and nine practical habits that start where the science is strongest: the quality of the food on your plate.

In this episode, you’ll learn:

• Why normal fasting glucose with a rising A1c is so common, and what it really means

• How postprandial glucose spikes drive most of your blood sugar problem early on

• Which tests to ask for, including fasting insulin, HOMA-IR, and a continuous glucose monitor

• What “time in range” is and why it tells you more than years of fasting draws

• How a whole food, plant-based diet improves insulin sensitivity at the cellular level

• Simple habits like meal sequencing, post-meal walks, fiber, sleep, and stress resets

Check out the Habit Healers Community: https://www.skool.com/habithealers/about

Dr. Marbas Substack Article: https://drlauriemarbas.substack.com/p/what-does-it-mean-when-your-fasting

If you are lying awake at midnight, your problem probably started twelve hours ago.

That is the part most sleep advice gets backwards. The entire industry is built around bedtime, and the recommendations all sound the same. Dim the lights, put the phone down, take magnesium, buy a better mattress. And those things matter, which is why we will get to them. But the research keeps pointing to a different starting line. Your worst night of sleep may have been decided in the first thirty minutes after your alarm went off.

Think about your own morning. Did you go outside? Or did you check your phone in bed, make coffee in a dim kitchen, and get to work without spending any real time outdoors? Even with sunlight coming through windows, indoor light at your eyes is dramatically dimmer than being outside, and the circadian system cares about intensity, timing, and duration. If your morning routine keeps you indoors, you missed the most powerful daily signal your body needs to produce melatonin on schedule fourteen hours later. Your body never got a clear “start the clock” signal. So by 10 PM, when you want to feel drowsy, the system is still running behind.

The fix is a protocol that starts at sunrise and works both ends of the day.

The protocol is called Sunrise 8-3-1

Sunrise 8-3-1 is a bookend protocol that works the morning and the evening as a unit. SUNRISE means getting morning light within 30 minutes of waking. The 8 is the number of hours before bed to stop caffeine, the 3 is hours before bed to finish your last meal, and the 1 is the hour before bed when screens go off and a pen comes out. Four levers, one protocol, and they work together.

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The morning side

Behind your eyes, buried deep in the brain, sits a cluster of about 20,000 neurons called the suprachiasmatic nucleus. It is the size of a grain of rice and it runs your entire circadian system. Body temperature, hormone release, digestion, immune function, when you feel alert, and when you feel sleepy all answer to this clock.

The clock needs a daily reset signal, and that signal is light.

When morning sunlight enters your eyes, it does not take the same path as the light you use for reading or recognizing faces. Specialized cells in the retina called intrinsically photosensitive retinal ganglion cells (you do not need to remember that name) detect the blue-spectrum wavelengths abundant in daylight and send a direct signal to the suprachiasmatic nucleus. Two things happen almost immediately.

First, cortisol naturally rises after waking in what is called the cortisol awakening response. This is not the chronic stress cortisol that causes problems. It is a sharp morning pulse that tells your body it is time to be alert, and morning bright light amplifies that signal. Second, the light starts a countdown. Roughly fourteen to sixteen hours later, that same system will instruct the pineal gland to begin releasing melatonin, the hormone that makes you feel sleepy in the evening.

If you skip the morning light, the timer never starts cleanly. The cortisol spike drifts later or flattens out entirely, and the evening melatonin release drifts with it. You end up feeling groggy in the morning and wired at night because your body never got a clear “go” signal at dawn.

Researchers tested this by taking a group of adults camping in the Rocky Mountains for one week. No flashlights, no phones, no artificial light of any kind. By the end of the week, their melatonin onset had shifted approximately two hours earlier, aligning with sunset. The finding that stood out was that during their normal lives at home, these same participants received more than four times less light during the day than they did outdoors, and far more light in the evening. Their clocks were being pushed later in both directions.

Research on office workers has linked higher morning light exposure to faster sleep onset and better overall sleep quality scores. Controlled lab studies show that bright light shortly after waking produces a measurable cortisol surge that does not occur when the same light is delivered in the afternoon. The timing matters because morning light advances the clock while evening light delays it.

The practical piece is simple. Go outside within 30 minutes of waking for five to ten minutes of natural light, and leave the sunglasses inside because they block the wavelengths your retinal cells need. Overcast days still deliver far more circadian-effective light than any indoor fixture. Even heavy cloud cover produces several thousand lux at your eyes, compared to a few hundred lux from a bright kitchen light. That morning walk to the mailbox or five minutes with your coffee on the porch covers the SUNRISE portion of the protocol.

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The 8

Most people have a vague sense that they should not drink coffee too late in the day. “Nothing after 2 PM” is a common guideline, though nobody can quite remember where it came from.

A systematic review and meta-analysis pooled data from 24 studies and calculated the minimum time buffer between a standard cup of coffee and bedtime required to avoid measurable reductions in total sleep time. The number they arrived at was 8.8 hours, which is far longer than the six-hour cutoff most people assume.

That same review documented the aggregate cost of ignoring the cutoff. Across the included studies, caffeine reduced total sleep time by 45 minutes, decreased sleep efficiency by 7 percent, and increased wakefulness after sleep onset by 12 minutes. People often reported sleeping fine even when objective measurements showed otherwise. Their sleep was shorter, lighter, and more fragmented, but they could not feel the difference. They just woke up tired and blamed something else.

The reason the number is so high has to do with how the body processes caffeine. Caffeine works by blocking adenosine receptors in the brain. Adenosine is the molecule that accumulates during waking hours and creates sleep pressure. Block it, and you feel alert. But caffeine does not disappear quickly. Its half-life in healthy adults ranges from about two hours in fast metabolizers to ten hours in slow ones. The average is around five to six hours, meaning that half the caffeine from your 2 PM cup is still circulating at 8 PM. A quarter is still there at 2 AM.

Genetics plays a big role in where you fall on that spectrum, and so do hormonal factors. Oral contraceptives roughly double caffeine’s half-life, and pregnancy can triple it. If you have ever noticed that coffee hits you harder or lasts longer than it does for other people, your liver metabolizes probably on the slower end.

Eight hours is the evidence-based floor. For a 10 PM bedtime, that means last coffee at 2 PM. If you are a slow metabolizer or you drink large servings, the real number may be closer to ten or twelve hours. Count backward from your bedtime, and you have the 8 in the protocol.

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The 3

Most people accept that stimulants close to bedtime are a problem. Fewer people realize that food timing matters nearly as much, and for a completely different reason.

In the two to three hours before your habitual bedtime, your body begins preparing for sleep. Part of that preparation involves shifting how it handles fuel. Research shows that melatonin, the same hormone preparing your brain for sleep, also acts on receptors in the pancreas to reduce insulin output. When a large randomized trial measured melatonin levels during late versus early dinners, participants eating close to bedtime had melatonin levels more than three times higher, and their glucose and insulin responses were significantly worse. Glucose tolerance drops, fat oxidation slows, and the whole system begins winding down. This is normal and expected when you are not eating. The problem starts when you add a meal to the mix.

If you eat a full meal during this window, you are handing your body a metabolic project at the worst possible time. Glucose stays elevated longer because insulin cannot keep up, triglyceride clearance is delayed, and the body burns less of the dietary fat it just received. You are lying in bed while your bloodstream looks like it did right after lunch.

A randomized crossover trial tested this directly. Twenty healthy young adults ate the same meal on two separate lab visits, once at 6 PM and once at 10 PM, with a fixed sleep period from 11 PM to 7 AM. When dinner was late, participants had significantly higher nocturnal glucose, elevated cortisol through the night, and reduced fat burning while they slept. Conventional sleep staging showed no dramatic differences between the two nights, which is part of what makes this finding so important. You can eat late and still appear to sleep normally on a lab report. But the metabolic profile during sleep shifts in an unfavorable direction, and if that pattern repeats night after night, the effects may accumulate.

The study also revealed something interesting about individual vulnerability. The participants who were naturally earlier sleepers showed the largest metabolic disruptions from late eating. If you tend to feel sleepy by 9 or 10 PM, your body may be particularly sensitive to meals that run up against that window.

How your body handles glucose depends not just on what you eat, but on when you eat relative to your internal clock. Meal timing and blood sugar regulation are connected around the clock, and the hours closest to sleep are when your metabolism is least equipped to handle a full plate of food.

Finish your last meal at least three hours before bed. The research compared eating one hour before bed versus five hours before, so three hours is a conservative practical target between those two points. If you are in bed by 10, dinner wraps up by 7, which gives your body time to clear the postprandial period before sleep deepens.

The 1

You have handled the morning with sunlight, the afternoon with a caffeine cutoff, and the evening with meal timing. Now comes the final hour, and the screens go off.

The reason screens interfere with sleep goes beyond the commonly cited blue light effect. Yes, light from phones and laptops suppresses melatonin. But the content is equally disruptive. Email, news feeds, group chats, and social media keep the prefrontal cortex in problem-solving mode. The brain does not shift from “engaged and evaluating” to “falling asleep” the way you flip a light switch. It needs a ramp-down period, and scrolling through your phone at 10:45 PM provides the opposite.

So what do you do with that hour instead? You pick up a pen. There are two options, and both have evidence behind them.

The brain dump. Researchers brought healthy young adults into a sleep lab for an overnight study. Five minutes before lights out, participants were randomly assigned to one of two writing tasks. One group wrote a to-do list of everything they needed to accomplish in the next few days, and the other wrote about activities they had already completed that day. Polysomnography, the gold standard for measuring sleep, tracked exactly how long it took each person to fall asleep.

The to-do list group fell asleep significantly faster. And the more specific and detailed their lists were, the quicker they dropped off.

The proposed explanation is cognitive offloading. Unfinished tasks create a low-level mental loop, with your brain circling back to things left undone and rehearsing them so you will not forget. Writing them down on paper closes that loop. The tasks are not gone, but they are stored somewhere outside your head, and your brain can let go of them for the night.

The gratitude journal. A large study of over 400 adults found that people who scored higher on measures of trait gratitude reported better sleep quality, shorter time to fall asleep, and longer sleep duration, even after the researchers statistically removed the effects of personality traits like anxiety and neuroticism. The relationship ran through a specific channel. Grateful people had more positive thoughts and fewer worried, anxious thoughts in the minutes before falling asleep. That finding is correlational, not experimental, but it points to something practical. What occupies your mind in those last few minutes before sleep appears to matter, and a short gratitude practice is a low-risk way to test whether shifting that mental content helps you.

What runs through your mind as you close your eyes shapes how quickly you fall asleep and how well you stay asleep. The to-do list empties the worry queue, and the gratitude journal fills that space with something better. You can do one or the other, or a few lines of each. Either way, screens go off one hour before bed and you spend five minutes with pen and paper. That final hour is the last piece of the protocol.

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The full protocol

SUNRISE Within 30 minutes of waking, go outside for 5 to 10 minutes of natural light. No sunglasses.

8 Last caffeine at least 8 hours before your target bedtime.

3 Last meal at least 3 hours before bed.

1 One hour before bed, screens off. Five minutes of pen-and-paper writing. A to-do list, a gratitude journal, or both.

The morning and the evening work as a pair. Fixing only the bedtime side solves half the problem, and fixing only the morning does the same. This protocol works because each piece reinforces the others. Morning light sets the melatonin timer, the caffeine and meal cutoffs protect the hours when that melatonin is supposed to be rising, and the pen-and-paper shutdown clears the mental noise that would otherwise override the whole system.

Start this Monday by picking whichever piece feels most doable, then add the others over the week. By Friday, you will have the full protocol running.

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Sunrise 8 3 1

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References:

1. Wright KP Jr, McHill AW, Birks BR, Griffin BR, Rusterholz T, Chinoy ED. Entrainment of the human circadian clock to the natural light-dark cycle. Curr Biol. 2013;23(16):1554-1558. doi:10.1016/j.cub.2013.06.039

2. Gardiner C, Weakley J, Burke LM, et al. The effect of caffeine on subsequent sleep: A systematic review and meta-analysis. Sleep Med Rev. 2023;69:101764. doi:10.1016/j.smrv.2023.101764

3. Scullin MK, Krueger ML, Ballard HK, Pruett N, Bliwise DL. The effects of bedtime writing on difficulty falling asleep: A polysomnographic study comparing to-do lists and completed activity lists. J Exp Psychol Gen. 2018;147(1):139-146. doi:10.1037/xge0000374

4. Wood AM, Joseph S, Lloyd J, Atkins S. Gratitude influences sleep through the mechanism of pre-sleep cognitions. J Psychosom Res. 2009;66(1):43-48. doi:10.1016/j.jpsychores.2008.09.002

5. Gu C, Brereton N, Schweitzer A, et al. Metabolic Effects of Late Dinner in Healthy Volunteers-A Randomized Crossover Clinical Trial. J Clin Endocrinol Metab. 2020;105(8):2789-2802. doi:10.1210/clinem/dgaa354

6. Garaulet M, Lopez-Minguez J, Dashti HS, et al. Interplay of Dinner Timing and MTNR1B Type 2 Diabetes Risk Variant on Glucose Tolerance and Insulin Secretion: A Randomized Crossover Trial. Diabetes Care. 2022;45(3):512-519. doi:10.2337/dc21-1314

Most of us assume that staying strong is about how much we can lift. But here’s the part most people miss: as we age, power declines faster than raw strength, often twice as fast, and power is what catches you when you stumble, gets you up off the floor, and lets you step off a curb without thinking. I walk you through what the research actually shows, including a study of more than a hundred thousand adults linking grip strength to all-cause mortality, and a six-month trial in previously inactive older adults that moved nearly every marker of aging in the right direction.

Then I get practical. I explain why a single kettlebell is one of the best home tools for building functional strength, power, and balance in a few square feet, and I lay out exactly how to start.

What you’ll learn in this episode:

• Why muscle power, not just strength, is the key to aging well and staying independent

• How grip strength works as a signal for whole-body muscle health and longevity

• What kettlebell training did for grip strength, walking distance, and balance in adults aged 59 to 79

• Why twelve minutes of swings can build both strength and explosive power

• How to choose your first kettlebell and progress safely without getting hurt

• A simple ten-minute, three-day-a-week beginner routine to start this week

Check out the Habit Healers Community: https://www.skool.com/habithealers/about

Dr. Marbas Substack Article: https://drlauriemarbas.substack.com/p/the-single-piece-of-iron-that-trains

Twice a day, the ocean rises and falls. This is the tide, driven by the pull of the moon, and it is one of the most predictable forces on the planet. Along most coastlines, the rising water simply spreads across the beach and retreats. But on certain rivers, where the ocean meets a narrowing channel, the incoming tide does something different. Instead of spreading out, it gets funneled upstream. The water stacks up, gains speed, and forms a wave that rolls miles inland against the river’s current.

On the River Severn in England, people gather on the banks before sunrise several times a year to watch this happen. The wave can be waist-high, fast enough to surf, and loud enough to hear from a distance.

This wave is called a tidal bore. Whether it arrives as a gentle ripple or a wall of water depends on how high the incoming tide is, how narrow the channel has become, and how low the river had dropped before the tide arrived.

Your cardiovascular system runs its own tidal bore every morning.

While you sleep, blood pressure sinks to its lowest point of the day, typically falling 10 to 20 percent below daytime levels. Then, in the final hours before dawn, a wave of hormones and nerve signals begins to push pressure upstream. Cortisol spikes, adrenaline surges, and the renin-angiotensin system fires while blood thickens and platelets become stickier.

In most people, this morning rise is smooth. The vascular system absorbs it the way a wide, open river mouth absorbs an incoming tide. But in some people, the surge is a wall of water. And unlike a river, your arteries can’t just flood the banks without consequence.

This is why heart attacks and strokes cluster between 6 AM and noon. The hour of awakening, not the hour on the clock, is the strongest predictor of cardiovascular crisis.

The question isn’t whether you have a morning blood pressure surge. Everyone does. The question is whether yours is a ripple or a wave. And if it’s a wave, what exactly is making it so big?

The Morning Tide

To understand what happens to your blood pressure every morning, it helps to think about what makes a tidal bore gentle or destructive.

The incoming tide is your sympathetic nervous system waking up. When you shift from deep sleep to wakefulness, adrenaline-like hormones rise sharply. Cortisol, which has been climbing since the early hours of sleep, peaks about 30 to 45 minutes after your eyes open. That cortisol makes your blood vessels more sensitive to those stress hormones, amplifying their ability to tighten the vessels. At the same time, another hormone system called the renin-angiotensin-aldosterone system kicks in, tightening vessels further and holding onto sodium.

At the same time, your blood itself is changing. Viscosity is higher in the morning, platelets clump more easily, and the enzyme your body uses to dissolve small clots drops to its daily low.

The shape of the channel is your arterial compliance. Young, flexible arteries stretch to accommodate the surge the way a wide river mouth absorbs an incoming tide. Stiff arteries, whether from aging, chronic inflammation, high sodium intake, or years of inactivity, funnel that surge into a much narrower passage. The wave gets bigger even when the tide stays the same.

The overnight low is the nocturnal dip. In healthy sleepers, blood pressure drops meaningfully during the night. That low river level means the morning tide has room to rise without flooding. But if blood pressure never dipped, if the river was already running near the top of its banks, the bore doesn’t need to be tall to cause damage. It just needs to crest.

Both the absolute morning level and the size of the surge carry risk. But across populations, the absolute morning level is the more reliable predictor. A moderate surge on top of a low overnight dip is far less dangerous than a small surge on top of a night that never really dipped at all.

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When the Bore Turns Destructive

The damage from an oversized morning surge is measurable, and it accumulates long before you feel a thing.

In a prospective study of more than 500 older adults with hypertension, researchers performed ambulatory blood pressure monitoring and brain MRI scans at baseline, then followed the patients for an average of about three and a half years. Those whose morning surge fell in the highest category had nearly three times the stroke risk compared to the rest of the group, even after the analysis controlled for their overall 24-hour blood pressure. The MRI data added another layer. At the very start of the study, before any clinical events had occurred, the highest-surge group already had markedly more silent brain infarcts on imaging. The structural damage was accumulating invisibly, stroke by stroke, with no symptoms to announce it.

A second, larger study took this further. Researchers pooled ambulatory blood pressure data from nearly 6,000 people across eight populations and followed them for a median of more than 11 years. Those in the highest category of sleep-trough morning surge had significantly elevated risks of death from any cause and of cardiovascular events overall, including coronary events. The findings held after adjustment for age, sex, body weight, smoking, diabetes, cholesterol, and the nighttime blood pressure level itself. But an important detail emerged from this analysis. The preawakening surge, the rise that happens before you actually wake up, was not prognostic. What mattered was the total distance between the lowest overnight pressure and the morning peak. In other words, what happened during sleep shaped the severity of the morning wave just as much as the wave itself. A high river predicts a destructive bore even when the tide is ordinary.

Five Reasons Your Bore Might Be Too Big

If morning blood pressure is universally elevated by the dawn surge, why do some people get a destructive bore while others get a ripple? The answer usually involves more than one of these factors working together.

The channel has narrowed. As arteries stiffen with age, chronic inflammation, or prolonged inactivity, they lose their ability to absorb the morning surge. Pulse wave velocity, a measure of how fast a pressure wave travels through the arterial tree, rises with stiffness. And research consistently links higher arterial stiffness with a larger morning surge. The same tide hitting a narrower channel generates a bigger wave.

The river never dropped. In a healthy pattern called “dipping,” nighttime blood pressure falls at least 10 percent below daytime values. But a significant proportion of people with hypertension are “non-dippers” or even “reverse dippers” whose pressure stays flat or actually rises overnight. When the river is already high, the bore crests with less provocation. A study of hypertensive men who underwent both 24-hour blood pressure monitoring and overnight sleep studies found that those with a nondipping pattern had far higher rates of significant obstructive sleep apnea compared to those who dipped normally. The adjusted odds of meaningful sleep apnea were more than five-fold higher in the nondipping group. The average sleepiness score in the study was low. These were men who did not feel tired during the day. They did not fit the classic profile of a sleep apnea patient. Based on symptoms alone, they never would have been screened.

The tide is chemically amplified. If you are salt-sensitive, and a substantial percentage of people with hypertension are, your kidneys may not be able to clear enough sodium during the day. Overnight, they compensate by keeping blood pressure elevated to force sodium out through the kidneys. That keeps the river high all night. And potassium, which promotes sodium excretion and protects blood vessel walls, is the missing counterbalance. Most people consuming a typical diet fall well below recommended potassium levels.

The floodgates open too fast. Your autonomic nervous system is supposed to ramp up gradually on waking. But several amplifiers can turn that gradual ramp into an abrupt spike. Cold bedrooms trigger sympathetic activation. Jarring alarm clocks do the same. Jumping straight from horizontal to vertical without a transition period allows blood to pool in the legs, triggering a compensatory blood pressure overshoot. And evening alcohol, through its rebound effect on the sympathetic nervous system during the second half of the night, sets the stage for a larger morning surge hours before you wake up.

The medication ran dry. Short-acting blood pressure medications taken in the morning may lose their effect by the next dawn. A drug with a short half-life can leave a gap in coverage during the exact hours when the bore arrives. This is the trough effect, and it is one of the most common reasons morning blood pressure remains elevated despite otherwise adequate treatment.

The channel lining has lost its protection. Your blood vessels depend on nitric oxide to stay relaxed and flexible. Overnight, nitric oxide levels drop as the enzymes that produce it slow down during sleep. When the surge arrives at dawn, the vessels are less able to dilate in response. This is especially pronounced with age, in people who eat a low-vegetable diet, and, perhaps surprisingly, in anyone who uses antibacterial mouthwash daily. The bacteria in your mouth that convert dietary nitrate into nitric oxide are the same ones that antibacterial rinses are designed to kill.

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Why Your Doctor Might Not See the Bore

A standard office blood pressure reading misses the bore entirely. By the time you drive to the clinic, sit in the waiting room, and roll up your sleeve at 10 AM, the bore has already passed. Your blood pressure at that moment may look perfectly reasonable. And if you’re being treated for hypertension and your in-office numbers are on target, your doctor has every reason to believe the medications are working.

But research consistently shows that a meaningful fraction of treated patients have what is called masked morning hypertension. Their office readings are normal. Their morning readings, taken at home before the commute and the coffee and the office visit, are not.

An international consensus panel defined morning hypertension as a home morning blood pressure averaging 135/85 mmHg or higher, regardless of what the office reading shows. For people at higher risk, including those with diabetes, coronary artery disease, protein in the urine from kidney involvement, heart failure, or who take anticoagulant or antiplatelet medications, the target is stricter, below 125/75 mmHg.

The same consensus defined exactly how morning blood pressure should be measured. Take it within one hour of waking, after urinating, before any medication or breakfast. Sit with your back supported, feet flat on the floor, and your arm at heart level. Rest for two minutes, then take two readings one minute apart and average them. Repeat for at least five consecutive days, ideally seven. Record every number.

The only way to see the bore is to be standing on the riverbank when it arrives.

What can you do about it?

Morning hypertension is real, common, and invisible to standard office visits. It independently predicts stroke, cardiovascular events, and silent brain damage. And it’s driven by specific, identifiable factors, each of which has a matched countermeasure. Nearly all of them are things you can start this week without a prescription.

Upgrade now to access the Bore Map protocol, nine habits matched to the nine drivers of morning blood pressure, plus the 7-Day Bore Watch printable tracking worksheet.

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The Life’s Essential 8 framework scores you from 0 to 100 across four health behaviors (diet, physical activity, nicotine exposure, and sleep) and four health factors (BMI, blood lipids, blood glucose, and blood pressure). I break down what each component measures, the exact scoring thresholds the AHA uses, and the research showing why people with high cardiovascular health live longer, age slower biologically, and lower their risk of heart disease, stroke, dementia, and diabetes. Then I give you the one-metric strategy I recommend to my patients instead of trying to overhaul everything at once.

What you’ll learn in this episode:

• How to calculate your own cardiovascular health score using Life’s Essential 8

• Why non-HDL cholesterol and sleep duration matter more than most people realize

• The connection between Life’s Essential 8 scores, biological age, and life expectancy

• How to use the AHA’s free My Life Check tool to assess your heart health

• Which single habit to change first if your score is low
  
  
  Check out the Habit Healers Community: https://www.skool.com/habithealers/about
  
  Dr. Marbas Substack Article: https://drlauriemarbas.substack.com/p/whats-your-hearts-gpaA
  
  

I walk you through what I call the garage model of metabolic health: the idea that your fat tissue has a fixed number of parking spaces, and trouble begins only when that garage fills up and fat starts spilling into your liver, muscles, and the space around your organs. This is where fatty liver disease, rising triglycerides, and high blood sugar actually come from. I break down the cascade one domino at a time, from overloaded fat cells to visceral fat, to a fatty insulin-resistant liver, to the cholesterol changes that standard testing often misses.

Then comes the hopeful part. I explain why this cascade reverses in a predictable order, why your pancreas may be recovering rather than failing, and why diabetes remission depends far more on losing enough weight than on where you started.

What you’ll learn:

• Why metabolically healthy obesity and thin people with high blood sugar both come down to fat storage capacity

• How visceral fat and fatty liver disease quietly drive insulin resistance

• Why your triglyceride-to-HDL ratio and ApoB can catch problems years before a glucose test

• The order in which liver, lipids, and the pancreas recover during diabetes reversal

Which blood markers and labs to request, including HOMA-IR

Check out the Habit Healers Community: https://www.skool.com/habithealers/about

Dr. Marbas Substack Article: https://drlauriemarbas.substack.com/p/your-fat-cells-just-walked-off-the

At 2:14 on the afternoon of August 14, 2003, inside a control room in Akron, Ohio, something stopped working. Nobody noticed.

The something was an alarm system. It was the only way the operators in the room could tell when a piece of the electrical grid was in trouble. Every time a transmission line overloaded or a generator tripped offline, this system was supposed to flash a warning on their screens and print it on the paper log rolling out of the machine in front of them. At 2:14 PM, a glitch deep in the software locked the whole thing up. The paper kept rolling, but the pens froze at their last reading. The screens kept glowing, but the numbers on them stopped updating. From that moment on, the operators were staring at a picture of the grid as it had been at 2:14, not as it actually was. And none of them knew it.

Over the next ninety minutes, on a hot, still afternoon with air conditioners running hard across northern Ohio, three major high-voltage transmission lines sagged in the heat and dropped into overgrown trees. One by one, they tripped offline. Each failure pushed more current onto the remaining lines, overloading them further. Inside the Akron control room, not a single alarm flagged any of it.

But forty miles east, at the Perry Nuclear Generating Station, an operator could see what nobody in Akron could. His instruments were swinging wildly. He called the control room three times in ten minutes, each call more urgent than the last. At 3:36 PM, he told them he knew something wasn’t right. At 3:42, he said he didn’t know how much longer his plant was going to survive. By 3:46, his message was blunt. It’s not looking good, he said. We ain’t going to be here much longer and you’re going to have a bigger problem.

Nobody in Akron could help him, because nobody in Akron could see what he was seeing.

At 4:05 PM, the last critical transmission line into Cleveland tripped. This time it wasn’t a tree. A protective relay simply read the combination of surging current and collapsing voltage and interpreted it as a fault. After that, nothing could stop it. Within seven minutes, roughly 50 million people across eight states and parts of Canada had lost power in the largest blackout in North American history.

The investigation that followed did not blame a piece of equipment. A joint U.S.-Canada task force reconstructed the afternoon second by second using control room recordings, and their root cause finding used a phrase that could have come straight from a medical chart. The problem, they concluded, was “inadequate situational awareness.” The operators responsible for the grid had mistaken the absence of alarms for the absence of problems.

Your body runs on a system that works exactly the same way. And for decades, medicine has been making exactly the same mistake.

Three Specialists, Three Screens, One Patient

Think about how most people interact with the medical system when it comes to chronic disease. If your blood sugar is off, you see an endocrinologist. If your blood pressure is high, a cardiologist manages the cardiovascular piece. If your kidneys start to decline, a nephrologist enters the picture. Each one watches their own screen. Each one is very good at what they do.

But your heart, your kidneys, and your blood sugar regulation aren’t separate stations operating on independent circuits. They share the same wiring. Visceral fat, the metabolically active kind stored around the organs, doesn’t just sit there. It pumps inflammatory signals into the bloodstream. Those signals do two things simultaneously. They make cells less responsive to insulin, which pushes blood sugar higher. And they damage the endothelium, the thin lining inside blood vessel walls that keeps the whole system running smoothly.

Once the endothelium is compromised, blood pressure begins to climb. Cholesterol particles lodge more easily in artery walls. And the kidneys, which filter your entire blood supply hundreds of times each day through millions of microscopic filtering units, start taking damage.

This is the point where the cascade accelerates. Damaged kidneys lose the ability to regulate blood pressure precisely, which pushes blood pressure higher still. They become less efficient at clearing metabolic waste, which increases oxidative stress throughout the body. The heart, now pumping against stiffer arteries and higher resistance, begins to remodel, with thickening walls and altered filling patterns. And as cardiac output shifts, kidney perfusion drops, which damages the kidneys further.

Each organ’s decline worsens the conditions for the others. Just like each transmission line failure on August 14 pushed more current onto the remaining lines until they, too, sagged into trees.

In 2023, the American Heart Association looked at this cascade and did something medicine rarely does. Instead of naming another individual disease, they named the connections between diseases. They called it cardiovascular-kidney-metabolic syndrome, or CKM syndrome. And then they built a staging system for it.

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Five Stages of a Cascade

The staging system runs from 0 to 4. Each stage maps to a specific point in the cascade, and each one changes what screening and intervention look like.

Stage 0 is a healthy grid. Normal weight, normal blood sugar, healthy blood pressure, good lipid numbers, kidneys filtering well, no signs of cardiovascular trouble. Everything is running within its designed capacity.

Stage 1 is early strain. The system is carrying more load than it was built for. This might show up as excess body weight, abdominal obesity, or the early glucose handling problems that define prediabetes. Blood pressure might still read normal and the kidneys might still be fine, but the wiring is running warm, and without intervention, breakers will eventually trip.

Stage 2 is the first real equipment damage. Metabolic risk factors have now emerged, whether that’s high blood pressure, elevated triglycerides, diabetes, or metabolic syndrome. Or the kidneys are showing measurable decline through reduced filtration or protein leaking into the urine. Multiple nodes on the grid are now compromised, and the stress is traveling between them.

Stage 3 is the stage that matters most from a mortality standpoint, because this is where the largest jump in risk occurs. Cardiovascular disease is developing beneath the surface. Coronary artery calcification may be building, cardiac biomarkers may be creeping up, and risk calculators that account for metabolic and kidney factors are flashing warnings, yet the person feels perfectly fine. This is the clinical equivalent of the Perry nuclear operator watching his instruments thrash while the Akron control room says everything looks normal. The grid is failing, but the lights are still on.

Stage 4 is the blackout itself. Clinical cardiovascular disease, such as heart failure, coronary artery disease, stroke, atrial fibrillation, or peripheral artery disease, has arrived on top of metabolic dysfunction or kidney disease. Management shifts from prevention to damage control.

Population data tells us something striking about where most people fall on this spectrum. Research using nationally representative health surveys has found that the majority of adults already sit at stage 2 or higher, and most don’t know it. CKM syndrome isn’t a rare condition that happens to sick people. It may be the most common chronic health pattern that most people have never heard of.

The investigation into the 2003 blackout found something specific and concrete about what could have stopped the cascade. If someone in the Akron control room had ordered 1,500 megawatts of deliberate load-shedding in the Cleveland-Akron area before 4:05 PM, the blackout could have been prevented. That’s a modest, targeted intervention at a specific moment. CKM staging works the same way. Catching the cascade at stage 1 or 2 and intervening with the right habits can slow it, stop it, or in some cases reverse it.

But you can only catch it if somebody is watching the whole grid. And that requires tests most people have never been asked about.

You now know the framework and you can see the grid, but two questions remain. Where do you stand on this staging system right now? The answer lives in a handful of lab tests, including one most people have never had ordered and another your doctor may not think to request. And what can you actually do about it? Recent evidence shows that lifestyle habits are the single most effective intervention at every CKM stage, and the specific findings may change how you think about your daily routine. Below, the full lab guide, the habit protocol, and a printable worksheet to take to your next appointment.

Upgrade now to access the lab guide, habit protocol, and printable worksheet.

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I’m Dr. Laurie Marbas, and on The Habit Healers Podcast I walk you through what fasting glucose and HbA1c actually measure, and what they leave out. We talk about why fasting insulin is the test almost no one orders, how your pancreas can keep your numbers looking perfect for years while damage builds underneath, and the link between insulin resistance and type 2 diabetes, heart disease, fatty liver, PCOS, and even brain health. Then we get to the good news: this is reversible. I share the exact sequence of small daily habits, starting with blood sugar, that builds metabolic health the way a flywheel builds momentum.

What you’ll learn in this episode:

• Why a normal fasting glucose can hide insulin resistance for years

• The one blood test to ask your doctor for: fasting insulin

• How insulin resistance connects to type 2 diabetes, heart disease, and Alzheimer’s

• Why walking 10 minutes after your largest meal steadies blood sugar

• How a continuous glucose monitor turns your body into a real-time experiment

The habit-stacking system that makes healthy choices automatic

Check out the Habit Healers Community: https://www.skool.com/habithealers/about

Dr. Marbas Substack Article: https://drlauriemarbas.substack.com/p/what-if-your-fatigue-your-belly-fat

I’m Dr. Laurie Marbas, a board-certified lifestyle medicine physician, and this is one of the most common patterns I see in my practice. A patient comes in with a “normal” fasting glucose of 95 and an A1c that’s quietly drifting from 5.1 to 5.4 to 5.6, and they’re told everything is fine until suddenly it isn’t. The research actually shows that for people in this early-warning zone, postprandial glucose accounts for roughly 70% of the total problem, and it deteriorates years before fasting numbers move. We’ll cover the labs most doctors don’t order, including fasting insulin and HOMA-IR, why a whole food plant-based diet remains the most powerful lever for reversing insulin resistance, and the small, doable habits that smooth out blood sugar spikes after meals.

What you’ll learn in this episode:

• Why fasting glucose misses postprandial blood sugar spikes and what that means for prediabetes risk

• The specific lab tests to ask for, including fasting insulin, HOMA-IR, fructosamine, and CGM time-in-range

• How meal sequencing and a 10-minute post-meal walk can lower post-meal glucose by up to 37%

• Why a whole food plant-based diet improves insulin sensitivity at the cellular level

• How sleep, stress, and hydration quietly drive glucose dysregulation

• When to ask your doctor about iron deficiency and other conditions that distort A1c

Check out the Habit Healers Community: https://www.skool.com/habithealers/about

Substack Article: https://drlauriemarbas.substack.com/p/what-does-it-mean-when-your-fasting

In the 1960s, researchers ran a beautifully simple experiment. They gave people glucose two ways. By mouth, and straight into a vein. The sugar was the same and so was the amount. On paper, the body should have responded identically.

It didn’t. When people drank the glucose, their pancreas released significantly more insulin. Something in the gut was sending a signal the vein couldn’t replicate.

It took decades to find the messengers. First came GIP, a hormone from the upper small intestine that surges when fat and carbohydrates arrive. Then GLP-1, from the lower gut, which boosts insulin, slows stomach emptying, and acts directly on brain regions that control hunger and reward.

The problem was that natural GLP-1 vanishes from the blood in about two minutes. Building a version that lasted long enough to be useful as a medication took years of work. Part of the answer came from an unlikely place, the saliva of a Gila monster, a desert lizard that carried a molecule similar to GLP-1 but far more durable.

That was the beginning. What has happened since is three distinct generations of medication, each one targeting a different combination of hormonal signals. And most people, including many prescribers, are still working from an outdated map.

This article is the updated map.

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The thermostat in your brain

Before we talk about the drugs, we need to talk about what they’re working on.

Your brain has a thermostat for body weight. It sits deep in a region called the hypothalamus and pulls together signals from your gut, your fat tissue, your blood sugar, and your nervous system. When everything is working, this thermostat keeps your weight stable within a fairly narrow range. You eat more one day, less the next. The system balances itself.

In obesity, the thermostat is set too high. The brain defends a weight that is damaging the body. Hunger hormones run loud while fullness signals get muted, and the reward value of food climbs until no amount of knowing better can override a thermostat that is wired to fight you.

What looks like a willpower problem is actually a signaling problem. And that is what these medications are designed to fix.

Generation one turns down the volume

The first generation of these drugs targets the GLP-1 receptor. Semaglutide is the most widely prescribed. Most people know the name Ozempic (approved for type 2 diabetes, though widely used off-label for weight loss) or Wegovy (approved specifically for weight management). It mimics the GLP-1 hormone your gut produces after a meal, but it lasts days instead of minutes.

What it does is straightforward. It tells your brain you are full and slows digestion so food stays in your stomach longer. It also turns down the reward response to food, particularly the highly processed, highly palatable kind that is hardest to resist.

Patients describe this last effect as “the quiet.” The constant mental chatter about food, what to eat next, whether to stop for a drive-through, whether there are snacks in the pantry, gets turned down. For people who have lived with that noise for decades, the relief is profound.

In large clinical trials, this generation of drug produces average weight loss in the range of fifteen percent of body weight over about sixteen months. A major heart outcomes trial of more than seventeen thousand people showed a twenty percent reduction in heart attacks, strokes, and cardiac deaths. And in March 2026, the FDA approved a higher-dose version (7.2 mg) that pushed average weight loss above twenty percent, closing the gap with the next generation.

But turning down the volume was only the beginning.

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Generation two changes the station

Tirzepatide, sold as Mounjaro and Zepbound, does something fundamentally different. It doesn’t just target GLP-1. It simultaneously activates the GIP receptor, a second hormonal pathway with distinct effects.

While both GLP-1 and GIP receptors are found in fat tissue, GIP appears to play the more active role there. When GIP signaling kicks in, fat cells change the way they handle fuel. After a meal, they get better at pulling sugar and fat out of the blood and storing it properly. Between meals, they get better at releasing stored fat for energy. Research suggests this effect on fat cell metabolism happens even apart from the weight loss itself.

The clinical difference is clear. In the first head-to-head trial comparing tirzepatide directly against semaglutide, tirzepatide produced roughly six percentage points more weight loss over the same time period, with fewer people quitting due to side effects.

Generation two isn’t just a louder version of generation one. It is working on the metabolism in a way that generation one does not.

Generation three turns up the furnace

And then there is retatrutide.

Retatrutide is a triple agonist, meaning it activates three different hormone receptors at once. It hits GLP-1, GIP, and a third target that neither of the first two generations touch. The glucagon receptor.

Glucagon is the hormone your body uses to unlock stored energy. It tells the liver to release sugar into the blood and promotes the breakdown of fat. And in research going back decades, glucagon has been shown to increase the number of calories your body burns at rest by a meaningful margin, in part through liver-mediated pathways.

The concern with glucagon has always been that it raises blood sugar. That is why nobody tried to build a drug around it by itself. But when you combine glucagon with GLP-1 and GIP, the blood-sugar-lowering and appetite-suppressing effects of those two hormones balance out glucagon’s sugar-raising tendency. What you get is a molecule that suppresses appetite and improves how fat cells work while also increasing the calories your body burns. Instead of adjusting one dial, this drug adjusts several at once.

In a Phase 2 trial published in 2023, retatrutide at its top dose produced average weight loss at levels not previously reported in obesity medication trials of comparable duration.

The first Phase 3 results arrived in December 2025 and confirmed the pattern. Participants on the 12 mg dose lost an average of roughly seventy pounds over sixty-eight weeks, with substantial reductions in knee pain for those with osteoarthritis. A safety signal worth watching is dysesthesia (an abnormal tingling or prickling sensation), which appeared in about one in five of these participants. Phase 2 had reported milder skin-sensitivity events at lower rates, so sensory symptoms may be dose-dependent rather than entirely new. This will need to be tracked carefully as additional Phase 3 data arrives throughout 2026.

Retatrutide is not yet approved and is likely still two years from pharmacy shelves. But it represents something genuinely new among modern obesity medications. It is among the first in this class designed to address calorie burning on the output side, not just appetite on the input side.

And there is another promising development. In a Phase 2 substudy of people with fatty liver disease, retatrutide produced some of the largest reductions in liver fat seen in any clinical trial to date.

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A quick summary before we go deeper

Generation one (semaglutide) turns down hunger. It works on your brain’s appetite and reward centers.

Generation two (tirzepatide) turns down hunger and changes how your fat tissue processes energy. It works on your brain and your fat tissue.

Generation three (retatrutide) does both of those things and turns up the furnace. It works on your brain, your fat tissue, and your liver.

Each generation adds a dial. The side effect profiles overlap significantly, with nausea, vomiting, and diarrhea remaining the most common across all three. But the metabolic picture gets more complex with each step, and the weight loss results have increased accordingly.

So why does the drug stop working?

This is the question that brings people to their doctor’s office frustrated, convinced their medication has failed. They lost weight for six months, maybe nine, and then the scale stopped moving. The dose went up and nothing changed. They wonder if their body has become “immune” to the drug.

It hasn’t, but what has happened is worth understanding.

When you lose weight, your body requires less energy to exist. A smaller body burns fewer calories at rest. It costs less energy to move. And on top of that straightforward math, the body adds a layer of metabolic self-defense. Leptin (your “I’m full” hormone) drops. Ghrelin (your “I’m hungry” hormone) rises. The brain turns up its hunger signals. And your calorie burn drops by more than the weight loss alone would explain. Researchers call this metabolic adaptation, and it has been documented in every form of weight loss, including surgery.

A recent study modeled this plateau specifically for GLP-1 drugs and found something useful. These medications delay the plateau compared to dieting alone because they keep suppressing appetite even as the body’s hunger hormones push back. But they cannot eliminate the plateau entirely. At some point, the energy your smaller body needs and the energy you take in reach a new balance, and the weight levels off.

There is also a less obvious shift that plays a role. The stomach-slowing effect of GLP-1, one of the reasons you feel full longer early on, tends to fade over weeks of continuous use. The appetite-suppressing effects in the brain hold up better, but the digestion-slowing piece weakens. This does not mean the drug has stopped working. It means one of its several mechanisms has partially adapted while others continue.

The plateau means your body has arrived at a new defended weight on the medication. The question is what to do about it.

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So what do you do now?

This is where the article gets practical. What do you do when you’ve hit the ceiling on your current medication? When is switching drugs the right move? What lifestyle changes actually amplify these drugs, and which ones are noise? And how do you build the platform that lets you eventually step down or off?

Upgrade now to access the full protocol, including the updated Off-Ramp Readiness Checklist and a printable GLP-1 Companion Worksheet.

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You go in for your annual blood work. A few days later, the results pop up in your patient portal. Fasting glucose looks normal, and maybe an HbA1c if your doctor thought to order one, also normal. You close the app and move on with your day, because according to the numbers, you’re fine.

Except you don’t feel fine. You’re exhausted by two in the afternoon and it has nothing to do with how much you slept. The weight around your midsection won’t budge no matter what you change. You walk into a room and forget why you’re there. Your doctor looked at the same panel you’re looking at and said everything was within range, and you left the office with that strange feeling of being told you’re healthy by someone who can’t explain why you feel like you’re falling apart.

The reason is simple. Your doctor was checking the water level in the boat. Nobody looked for the leak.

The Test Most Doctors Skip

Standard blood work measures fasting glucose, and sometimes HbA1c. Both measure sugar. Neither measures insulin, and that is a problem, because insulin is where the story actually begins.

Insulin is the hormone that tells your cells to open up and let glucose in so it can be used for energy. When everything works the way it should, insulin does its job efficiently, glucose moves into your cells, and you feel steady all day. But when your cells start ignoring insulin’s signal, your pancreas has to compensate by producing more of it. Think of it like knocking on a door. At first, a normal knock gets someone to answer. Over time you have to knock louder. Then you’re pounding. Then you’re standing outside shouting while the person inside turns up the television.

And the whole time this is happening, your fasting glucose looks perfectly normal, because your pancreas is working overtime to keep it that way. The extra insulin is doing damage you will never see on a standard lab panel. It is driving inflammation, storing visceral fat around your organs, disrupting your hormones, and slowly straining your liver. For years, this can build without a single number on your chart looking wrong. By the time your glucose finally rises enough for a doctor to write “prediabetes” in your file, the insulin resistance underneath it has been running the show for years.

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What Insulin Resistance Is Actually Doing

When researchers analyzed nationally representative health data from over 8,700 Americans, they found that only about 12% of U.S. adults met the criteria for optimal metabolic health across five cardiometabolic markers including blood sugar, blood pressure, waist circumference, and blood lipids. Turn that around and the picture gets uncomfortable fast. Roughly 88% of American adults have at least one marker of poor metabolic health, and the prevalence was low even among people whose weight was considered normal. While that study measured metabolic health broadly, insulin resistance is the upstream condition that drives many of those same markers out of range.

What makes insulin resistance so consequential is the sheer range of conditions it feeds. Research has implicated it in the development and progression of type 2 diabetes, cardiovascular disease, fatty liver disease, and PCOS. A growing body of research now connects it to Alzheimer’s as well. Postmortem studies of Alzheimer’s patients consistently show reduced insulin signaling, reduced insulin receptor expression, and impaired glucose metabolism in the brain, independent of whether the person ever had type 2 diabetes during their lifetime. Some researchers have started calling it “type 3 diabetes,” because the pattern of insulin resistance in the brain overlaps with what happens in the rest of the body.

When you address insulin resistance, you are treating the metabolic soil that grows many of those conditions at once.

The good news is that insulin resistance is reversible, and the tools that reverse it are surprisingly simple. Small daily habits that compound over time.

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Why Habits Instead of Willpower

You already know what you’re supposed to do. Eat better, move more, sleep more, stress less. The problem has never been information, and if you’re reading this newsletter, you have more information than most physicians had a generation ago. The problem is that knowing what to do and actually doing it every day are completely different skills. One is knowledge and the other is behavior, and behavior is built through habits, not willpower.

Researchers studying habit formation asked volunteers to choose a new daily behavior and repeat it in the same context for 12 weeks. They wanted to know how long it takes for a new action to become automatic. Among those whose data could be modeled, the median answer was 66 days, though it ranged anywhere from 18 to 254 depending on the person and the complexity of the behavior. But the single most useful finding from the study had nothing to do with the number of days. It was that missing one day did not derail the process. The people who missed a single opportunity to perform their new habit and then picked it back up the next day did not significantly set back their habit formation. Consistency is the whole mechanism.

That is the difference between a diet and a system. A diet gives you rules you follow until you stop following them. A system of habits that run on autopilot, where each one makes the next one easier, keeps running long after the motivation that started it has faded.

The Healing Flywheel

Imagine a heavy metal flywheel, a massive disc mounted on an axle. You push it and it barely moves. You push again and get a tiny bit of rotation. You push a third time and a fourth, and it feels like all that effort is producing almost nothing. But what you can’t see is that each push is storing energy in the wheel. At some point, and you won’t be able to pinpoint exactly when it happens, the wheel’s own momentum starts doing part of the work for you. Eventually it is spinning with less effort than it took to get it started.

Your healing habits work the same way, but the order you build them in matters enormously.

We start with blood sugar because it is the hub of the wheel. When your glucose steadies, your energy stabilizes throughout the day. That steadier energy makes movement feel accessible instead of impossible. Daily movement deepens your sleep. Deeper sleep lowers cortisol. Lower cortisol reduces the cravings that used to hijack your food choices. And better food choices stabilize your glucose even further, which spins the wheel faster. Each pillar feeds the next one. By the third or fourth pillar, you are not white-knuckling anything. The flywheel is carrying you.

That sequence reflects the clinical logic behind every major lifestyle medicine guideline now being published. In 2025, a multidisciplinary panel of 20 experts published the first clinical practice guideline to position lifestyle interventions as primary therapy for prediabetes and type 2 diabetes, and they built it on evidence from over 100 randomized clinical trials and more than 100 systematic reviews. The pillars that guideline recommends, including nutrition, physical activity, sleep, stress management, and social connection, are the same ones the flywheel is built on. The evidence base is strong. What has been missing is a system that helps people actually do it.

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Why I Built The Habit Healers

If there is one thing I have learned after decades of clinical practice, it is that the people who get better are the ones who were given the right system.

I have watched patients come back year after year, having failed again, because they were handed a wish instead of a plan. “Eat better and exercise more” sounds responsible coming out of a doctor’s mouth and gives the patient absolutely nothing to do on Monday morning.

But I have also watched people turn the whole thing around. I have seen fasting insulin levels drop, HbA1c numbers normalize, medications get deprescribed, and energy come back in people who had been told for years that their decline was just aging. The difference was always structure. They had a sequence of small habits, built in the right order, that compounded until the system ran itself.

I built The Habit Healers to be that structure, a community on Skool built around a complete course called the Insulin Resistance Reversal Roadmap. Here is how it works.

The Insulin Resistance Reversal Roadmap

You start by getting your baseline labs, including a fasting insulin level, so you know where you actually stand. A specific staging framework places you on a spectrum from optimal to early insulin resistant to established to prediabetes to type 2 diabetes. Knowing your position on that spectrum changes what you do next, because a person at early insulin resistance and a person at established insulin resistance need different timelines and different expectations.

Then you put on a continuous glucose monitor. CGMs like Dexcom Stelo and Abbott’s Lingo are now available over the counter without a prescription, and within the first week of wearing one, you start learning things about your own body that no amount of generic nutrition advice could have told you. You see exactly which meals spike your glucose and which ones keep you flat. You see what happens after a 10-minute walk versus staying on the couch. You see what a bad night of sleep does to your fasting glucose the next morning. The monitor turns your body into a real-time experiment you’re running on yourself, and that feedback changes behavior faster than any lecture ever could.

From there, you move through five stations, building one or two habits at each. Your very first habit is a 10-minute walk after your largest meal. Research consistently shows that walking after eating has a significantly greater effect on post-meal glucose than walking before, and the sooner after the meal, the better. At each station you learn the science behind one pillar of metabolic health and add habits to your stack, some required and some chosen from a menu, installing each one using the CAN Test and the GRACE Method until it becomes automatic. Then you advance to the next station, keeping every habit you have already built. By the fifth station, you have around eight healing habits running without conscious effort, and together they form your personal daily operating system. You always know where you are, where you are going, and what to do right now.

Every Tuesday we meet live at 4 PM PT. Chef Martin Oswald’s recipes are available inside The Healing Kitchen to support your blood sugar habits as you build them. And the community, the people in there right now working through their own stations, actually shows up for each other every week.

There is no cohort start date, no deadline, and no schedule you are behind on. You move at your own pace and the system meets you wherever you are.

Your Monday Habit

Call your doctor’s office Monday morning and ask for a fasting insulin test added to your next blood draw. That is one phone call. If they seem unfamiliar with the request, the language is simple. “I’d like a fasting insulin level added to my next lab order.” If you would rather use a direct-to-consumer lab, you can order it yourself through Quest, Labcorp, or Walk-In Lab without a prescription.

You cannot reverse something you have not measured. And once you have that number, the question that follows is the obvious one. Now what do I do with it?

That is what we work on together inside The Habit Healers. Your number, your data, your habits, your pace.

Join The Habit Healers here. I’ll see you inside.

Habit Healers Community on Skool

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References:

1. Araújo J, Cai J, Stevens J. Prevalence of Optimal Metabolic Health in American Adults: National Health and Nutrition Examination Survey 2009-2016. Metab Syndr Relat Disord. 2019;17(1):46-52. doi:10.1089/met.2018.0105

2. de la Monte SM, Wands JR. Alzheimer's disease is type 3 diabetes-evidence reviewed. J Diabetes Sci Technol. 2008;2(6):1101-1113. doi:10.1177/193229680800200619

3. Engeroff T, Groneberg DA, Wilke J. After Dinner Rest a While, After Supper Walk a Mile? A Systematic Review with Meta-analysis on the Acute Postprandial Glycemic Response to Exercise Before and After Meal Ingestion in Healthy Subjects and Patients with Impaired Glucose Tolerance. Sports Med. 2023;53(4):849-869. doi:10.1007/s40279-022-01808-7

4. Lally, P., van Jaarsveld, C.H.M., Potts, H.W.W. and Wardle, J. (2010), How are habits formed: Modelling habit formation in the real world. Eur. J. Soc. Psychol., 40: 998-1009. https://doi.org/10.1002/ejsp.674

5. Rosenfeld RM, Grega ML, Gulati M. Lifestyle Interventions for Treatment and Remission of Type 2 Diabetes and Prediabetes in Adults: Implications for Clinicians. Am J Lifestyle Med. 2025;19(7):964-996. Published 2025 Mar 25. doi:10.1177/15598276251325802

6. Zhao X, An X, Yang C, Sun W, Ji H, Lian F. The crucial role and mechanism of insulin resistance in metabolic disease. Front Endocrinol (Lausanne). 2023;14:1149239. Published 2023 Mar 28. doi:10.3389/fendo.2023.1149239

Two patients walk into a doctor’s office on the same Tuesday morning.

The first weighs 220 pounds and has been heavy since college. Her blood sugar is normal, her cholesterol panel is clean, and her liver enzymes look like someone who runs marathons. She is, by every measurable standard, metabolically healthy.

The second weighs 155. She has never been diagnosed as overweight in her life. But her fasting blood sugar is creeping upward, her doctor is concerned about early fatty liver disease, and her triglycerides are high enough to flag a repeat test.

Same species. Wildly different outcomes.

You might assume the explanation involves willpower, or exercise, or some combination of genetics and discipline. But it doesn’t. The explanation starts with a question that almost no one in medicine thinks to ask.

How full are your fat cells?

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The storage limit you didn’t know you had

Think of your body’s fat tissue the way you would think of a parking garage. The garage has a fixed number of spaces. As long as spaces are available, incoming cars park safely and everything works. But once the garage fills up, cars start double-parking in fire lanes, blocking exits, and spilling onto the street.

Your subcutaneous fat, the fat stored just beneath the skin on your hips, thighs, and backside, is the garage. It was built to be your long-term energy storage system, absorbing extra fuel, tucking it away, and releasing it slowly between meals. When this system is working, your metabolism runs smoothly even if you gain weight. You can carry quite a lot of body fat and remain metabolically healthy, as long as the garage has room.

Here’s the thing. Every person’s garage is a different size.

A widely cited review published in 2008 proposed what is now called the adipose tissue expandability hypothesis. The core idea is both simple and powerful. Metabolic disease is not driven by how much fat someone carries. It is driven by the gap between how much they’re carrying and how much their personal storage system can handle. Exceed your own limit, and fat starts spilling into organs that were never meant to store it.

This explains one of the most striking paradoxes in medicine. People with lipodystrophy, a rare genetic condition where the body cannot form fat tissue properly and remains extremely lean, develop the same metabolic syndrome as people with severe obesity. Think about that for a moment. Almost no fat, same disease as too much fat. Both groups have exceeded their storage capacity. They just arrived there from opposite directions.

So what determines the size of your garage? Genetics play a major role. So do sex hormones, ethnicity, and the number of fat cells your body built during childhood and adolescence. Total fat cell count is set during the growing years and stays essentially fixed for life, even after major weight loss or bariatric surgery. Your body replaces about ten percent of its fat cells each year, but the total stays remarkably constant. You’re working with the number you were dealt by the time you finished growing.

This matters enormously for women at midlife. Before menopause, estrogen directs fat into subcutaneous hip and thigh storage, the so-called pear pattern. These depots are metabolically protective. They expand by making new, small fat cells rather than inflating existing ones to dangerous sizes. After menopause, as estrogen declines, fat distribution shifts toward the abdomen. Visceral fat can roughly double in the first five years after menopause, even without weight gain. The garage that served you well for decades starts filling up faster.

People of South Asian descent face a related challenge. At any given weight, South Asian individuals tend to carry more body fat in visceral and liver depots. Their garage tends to be smaller, which is one reason type 2 diabetes occurs at much lower body weights in this population.

Now here’s where the trouble begins. When that personal ceiling is reached, four things happen in sequence. Individual fat cells swell beyond their normal size. Blood supply can’t keep up, and oxygen levels drop inside the tissue. The tissue stiffens with a scar-like material that blocks further safe expansion. And immune cells begin surrounding the damaged, dying fat cells in distinctive ring-shaped clusters called crown-like structures.

At this point, your fat tissue has stopped being a storage system. It has become an inflamed, distressed organ. And that distress triggers a chain reaction that reaches into every corner of your metabolism.

This is the first domino.

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The spillover

Normally, insulin acts as a gatekeeper for your fat stores. After a meal, it signals fat cells to absorb incoming fatty acids and hold on to what they already have. Between meals, insulin levels drop and fat cells release a steady trickle of energy. The system is tightly controlled.

In swollen, inflamed fat tissue, the fat cells themselves become insulin resistant. Insulin arrives with its usual message, but the inflamed cells no longer respond. The inflammatory signals from those crown-like structures block insulin’s signaling pathway inside the fat cell. Fat tissue loses the ability to do the one job it was designed for. Fatty acids start leaking into the bloodstream at higher rates than normal, and the tissue fails to trap incoming dietary fat after meals.

Those fatty acids have to go somewhere. They flow to three places the body never designed for long-term storage. The liver. The muscles. And the visceral cavity, the space around the internal organs deep in the abdomen.

Now, most people think of visceral fat as simply the overflow. The belly fat. The stuff your doctor warns you about. But visceral fat turns out to be far more interesting than that.

It is a fundamentally different tissue than subcutaneous fat. Research has shown that visceral and subcutaneous fat cells express entirely different sets of developmental genes, differences that persist even when the cells are grown in identical lab conditions. These are not the same cells in different locations. They are different tissues from the embryo onward.

And visceral fat cells behave differently at every level. They are far more reactive to stress hormones, releasing fatty acids more aggressively during stress, during fasting, and during the chronic low-grade activation that comes with sleep deprivation and psychological pressure. They are also less responsive to insulin’s signal to stop releasing fat.

But here’s the anatomical detail that changes everything. Unlike subcutaneous fat, which drains into the general circulation where its output gets diluted across the whole body, visceral fat drains directly into the liver’s blood supply through a vessel called the portal vein. Every inflammatory signal and every free fatty acid that visceral fat releases arrives at the liver at full concentration. No dilution. We will come back to why this matters so much when we get to inflammation.

Despite this concentrated delivery system, most of the total fatty acid load hitting the liver still comes from subcutaneous fat spillover, simply because subcutaneous fat is so much larger in volume. Visceral fat acts more as a concentrated inflammatory amplifier than the primary source of fatty acids.

This is the second domino.

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What happens when your liver fills with fat

The liver is the critical destination in this chain. And what happens there is, frankly, one of the more fascinating things in all of metabolism.

Fatty acids flood in from three directions. The largest share comes from the spillover just described. A smaller but growing share comes from a process where the liver converts excess sugar into new fat molecules, a process accelerated by insulin. And a third portion arrives directly from the diet. In people with fatty liver disease, the liver’s own internal fat production increases dramatically.

That internal fat-making is driven by two signals at once. Insulin drives it through one pathway. Sugar, especially fructose, drives it through a completely separate one. When someone has high insulin and high blood sugar at the same time, both pathways are running full speed.

Now here is the paradox that sits at the center of the whole cascade. As fat builds up inside liver cells, the liver becomes deaf to insulin’s instruction to stop making sugar. So it keeps dumping glucose into the bloodstream. A major review published in 2014 explained the molecular mechanism. Fatty acid byproducts called diacylglycerols build up inside liver cells and jam the insulin receptor, breaking insulin’s ability to shut down glucose production.

But fat production keeps running. Research has shown that incoming sugar, especially fructose, activates a parallel fat-making pathway that operates independently of insulin. So even as the liver ignores insulin on the glucose side, the flood of sugar pouring through it keeps the fat-production machinery running at full speed. The result is that the liver runs both programs at once. Overproducing sugar. Overproducing fat. At the same time.

This is the worst possible combination.

Meanwhile, the liver starts exporting this excess fat into the bloodstream as large, triglyceride-loaded particles called VLDL. These particles are the starting material for everything that happens next on your cholesterol panel.

Excess fatty acids also accumulate inside muscle cells, where they jam insulin signaling through a closely related mechanism. Since muscles are a major site where blood sugar is taken up after eating, this failure means glucose stays in the bloodstream longer. The pancreas compensates by producing more insulin. Higher insulin drives more fat production in the liver, more spillover from fat tissue, and more fatty acid buildup in muscles.

The cycle feeds itself.

This is the third domino.

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How Your Cholesterol Panel Gets Hijacked

The science above explains what’s happening inside your body. But the dominoes don’t just fall forward. Below, you’ll find out how these changes rewrite every number on your cholesterol panel, where the inflammation really comes from, and how the entire cascade reverses, starting with the organ that recovers fastest. Plus the protocol for identifying where you are in this chain, the specific markers to ask your doctor about, and the printable worksheet to track your progress.

Upgrade now to access the protocol and printable worksheet.

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We dig into the gut hormones that tell your brain you’re full, GLP-1, CCK, and PYY, and why they need about twenty minutes to catch up to your fork. I share what researchers found when seventeen volunteers ate the same ice cream in five minutes versus thirty minutes, why chewing alone changes your hormone response, and what a six-year study of nearly 60,000 adults revealed about people who shifted from fast to slower eating. I’ll also tell you about a small German trial where six men lost a median of eleven percent of their body weight by simply slowing down at the table, and kept it off for almost two years.

Then I walk you through this week’s habit, The Slow Bite, a simple twenty-minute mindful eating practice you can start at your next meal.

What you’ll learn:

• Why fast eating is linked to belly fat, metabolic syndrome, and weight gain

• How GLP-1, CCK, and PYY create your natural “stop eating” signal

• Why chewing more slowly may reduce calorie intake by around twelve percent

• The connection between stress, eating speed, and overeating

A simple twenty-minute mindful eating habit you can start this week

Check out the Habit Healers Community: https://www.skool.com/habithealers/about

Dr. Marbas Substack Article: https://drlauriemarbas.substack.com/p/why-are-the-fast-eaters-three-times

What Martin learned from that project is something most home cooks never think about. Chain restaurants succeed or fail based almost entirely on their sauces. The rice and broccoli are more or less the same from kitchen to kitchen. What makes people come back, what makes a thousand different locations taste like the same place, is what goes on top. Martin went through five rounds of tastings with the CEO team before a single sauce was approved. That’s how much it mattered.

And here’s what makes this relevant to your Tuesday night dinner. The same principle applies at your kitchen table. Martin keeps about forty sauce recipes in his portfolio, but his advice for home cooks is to find three to five that your household genuinely loves and get comfortable making them on repeat. When he caters events for a thousand people, the strategy is identical. Good sauces on the table, everyone’s happy.

The problem is that most of the sauces people reach for work against them. A standard barbecue sauce starts with ketchup, which is roughly half corn syrup, then piles more sugar on top. An Alfredo runs about five hundred calories of butter, cream, and cheese before you’ve touched the pasta. These sauces taste good because fat and sugar are the easiest buttons to push for flavor. But they aren’t the only buttons.

Two Sauces, One Principle

During our live session this week, Martin built two completely different sauces to demonstrate a single idea. Every sauce, whether it’s barbecue or cream-based or a vinaigrette, needs four things working together. Something for viscosity, something for acidity, a spice layer, and a backbone ingredient that keeps the whole thing from tasting flat. Once you understand those four components, you can build dozens of sauces without ever opening a bottle.

For the barbecue sauce, dates replace corn syrup. They handle both jobs that corn syrup does in a traditional recipe, providing sweetness and that thick, sticky texture that makes barbecue sauce cling to food. Passata, a thick Italian tomato puree, replaces the ketchup. Toasted spices go in layered rather than singular. Martin uses chili powder alongside chipotle flakes rather than picking just one, because layering different forms of heat creates complexity that a single spice can’t. Dijon mustard acts as an emulsifier, binding everything together the same way it holds a vinaigrette in suspension. Mulberry or pomegranate molasses provides the deep, dark tartness that traditional molasses would. Apple cider vinegar adds acidity. Everything goes into the blender.

The finished sauce has no salt, no refined sugar, and no oil. And when Martin tasted it on camera, his eyebrows went up and he went quiet, which is how you know it’s actually good.

One detail worth stealing from his process. He tasted the sauce on a carrot stick, not off a spoon. A sauce eaten straight should taste intense. What matters is how it tastes on the food you’ll actually serve it with. That’s a professional habit most home cooks skip.

The Sauce Nobody Expects

The second sauce started with frozen English peas, which sounds like the least promising sauce ingredient imaginable. But peas bring three things to a blender that most people don’t realize. Their soluble fiber creates a smooth, creamy viscosity without any cream. They carry about four to five grams of natural sugar per hundred grams, which is enough sweetness to keep a sauce from tasting flat. And they puree into a bright green that looks genuinely beautiful on a plate.

Martin built this one as what he called a freestyle, applying the same four-component framework with completely different ingredients. Fenugreek, coriander, and black pepper toasted in a dry pan for the spice layer. Almond butter as the binder and a source of fat to help absorb fat-soluble vitamins. Lemon rather than vinegar for a gentler acidity that pairs better with the peas. And fresh horseradish, grated directly in, for backbone. Horseradish is a cruciferous vegetable, nutritionally in the same family as broccoli, and it provides enough heat to balance the natural sweetness of the peas without overpowering them.

The finished sauce can stand in anywhere you’d reach for a cream-based sauce. Pasta, roasted vegetables, grain bowls, crudités. At a fraction of the caloric load and with actual nutrients instead of saturated fat.

Why This Changes More Than You Think

The real takeaway from watching Martin work is that the viscosity and richness you associate with butter and cream and sugar can come from whole foods you already have access to. Dates, peas, cauliflower, corn, silken tofu, soaked cashews. Each one creates a different style of sauce base, and each one lets you skip the calorie-dense ingredients that make most sauces a metabolic problem rather than a metabolic asset.

If you’ve been buying bottled sauces because you assumed the homemade alternative would be complicated or bland, this is the week to test that assumption. Pick one of these two sauces, make it once, and taste it on whatever you’re already eating.

Join Us in The Habits Healers Community

Everything we covered in this episode is part of a bigger system. The Habit Healers Community on Skool is where I teach the full Insulin Resistance Reversal Roadmap and where Chef Martin Oswald's recipes are matched to each stage of your healing. You get the complete course, live coaching with me every Tuesday, the tools to see what is happening inside your body, and a community doing this together. Join the Habit Healers Community here. I'll see you inside.

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A Russian grain merchant in the 1700s did not know he was inventing exercise equipment. He was weighing wheat. The counterweight on his scale was a round chunk of iron with a handle welded to the top, and it weighed exactly one pood, the Russian unit of market weight, about sixteen kilograms or thirty-six pounds. The handle was there so he could lift the weight onto the scale without dropping it on his foot.

As the story goes, things got interesting when farmers at festivals started tossing the counterweights around for fun, and strongmen noticed. Touring performers began swinging and pressing poods onstage, and eventually the Soviet Union made the kettlebell its national sport. Somewhere along the way, a tool for measuring grain became a tool for building the human body.

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Why this object, and why now

Ask a ninety-year-old what they wish they could still do, and the answer is rarely about strength. It is about speed. Standing up from the floor before the dog knocks them over, catching themselves on the kitchen counter when a foot slips, stepping off a curb without hesitating. None of these are feats of strength. They are feats of power, which is strength applied fast.

Power declines faster than raw strength as we age, with measurable losses often beginning by midlife and accelerating in older adulthood. In one long-term study, power fell roughly twice as fast as force in the older adults followed. By the time someone notices it, a lot of it is already gone. Traditional slow-and-heavy lifting builds strength, but it does much less for the speed component that actually catches a stumble. What trains power is a movement that asks your muscles to produce force quickly, over and over, with time to recover in between. A kettlebell is one of the few tools in an ordinary home that can do that in a few square feet of floor space.

The strength that keeps you alive is not the kind you see in the mirror. In a study of more than a hundred thousand adults across seventeen countries, every eleven-pound (five-kilogram) drop in grip strength was linked to a sixteen percent higher risk of dying from any cause. Grip predicted death better than systolic blood pressure did. That does not mean squeezing a hand gripper extends your life. Grip is a signal. It reports on the whole muscular system that holds you upright, moves you forward, and carries your groceries up the stairs. When grip fades, so does a lot of what people mean by quality of life.

A kettlebell loads that system in a way almost nothing else in your house does. The weight hangs below your hand instead of sitting balanced in your palm, so your forearm has to fight to keep it from rotating out of your grip. Your posterior chain, the long line of muscles running up the back of your body from your heels to your shoulders, fires every time you pick the bell up. And because one bell can be swung, pressed, squatted with, carried, and hinged, a single piece of iron in the corner of a room can train almost every movement pattern that matters for staying functional as you age.

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Twelve minutes, twice a week

A group of twenty-one healthy young men in one controlled trial did nothing but kettlebell swings for six weeks, training twice a week for twelve minutes per session in a pattern of thirty seconds of swinging followed by thirty seconds of rest, repeated for twelve rounds. By the end, the heaviest half-squat they could perform had gone up by about twelve percent, and their vertical jump had gone up by about fifteen. A separate group doing a jump-squat power program designed specifically for explosive strength made similar gains, with no statistically significant difference between the two groups on either measure. This was a small proof-of-concept study in younger bodies, not a general-population trial. But it answered a clean question. Twelve minutes of swings, done twice a week, built both maximal strength and explosive power in the same people at the same time.

The swing is a fast, explosive movement driven by the hips, where the upward phase is maximum speed and the bell floats back down under control. That fast-up, controlled-down pattern is the same principle every good power-training protocol runs on. And the numbers behind it are surprising even to people who train seriously. When researchers compared a kettlebell swing to two standard power-training exercises in the gym, a loaded barbell squat and a jumping squat with added weight, the swing produced more total force over the length of each rep than either one. The peak force in any single instant was higher in the barbell lifts, but the swing sustained its force output longer across each repetition. In plain terms, the swing asks your muscles to produce a meaningful amount of force quickly and repeatedly, and your body responds by building exactly that capacity. A surprisingly large stimulus in a surprisingly small footprint of time and space.

The minimum effective dose for building strength turns out to be smaller than most people assume. You can build real strength and muscle on as few as four working sets per muscle group per week, using weights that let you do six to fifteen reps before you cannot do another, with bilateral multi-joint movements through a full range of motion. A kettlebell hinge, squat, and press cover that prescription in about ten minutes.

What this looks like past sixty

Twelve-minute swing sessions in twenty-something athletes is one thing. Here is what happened when researchers ran a similar program in a very different group. They recruited thirty-two previously inactive adults aged fifty-nine to seventy-nine and put them through a six-month study that included three months of progressive kettlebell training, which involved three supervised group sessions a week plus a couple of shorter home practice sessions. The program was built around the swing, clean, military press, goblet squat, and unloaded Turkish get-up.

By the end of the six-month window, the results read like a list of everything that normally slides the wrong direction with age, moving the right direction instead. Grip strength went up by about fifteen pounds (seven kilograms) per hand. The distance they could walk in six minutes increased by more than one hundred thirty feet (forty meters), which is roughly half a city block. The heaviest weight they could deadlift off the floor went up by about thirty-five pounds (sixteen kilograms). The number of times they could stand up from a chair in thirty seconds went up by more than three. The time to get down to the floor and back up five times, a test of balance and functional independence most people in their seventies dread, dropped by six seconds. And the muscle on their arms and legs, the kind you actually use to move your body, went up by more than a pound (half a kilogram).

Compliance with the program was ninety-one percent, and the people producing these numbers were not gym people to begin with. They had been told to exercise for years and had not, and they showed up anyway. This was one study, not a mountain of them, and it had the design limits most small trials have. But the direction and size of the changes are encouraging.

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The part where I tell you not to get hurt

A review of ninety-nine kettlebell research publications identified three published case reports of injury across the entire peer-reviewed literature. A thumb tendon irritation, a case of rhabdomyolysis (a condition where muscles are pushed so hard they start to break down), and a stress fracture in the forearm. The reviewers noted that each case appeared consistent with a training-load error, meaning too much weight, progressed too quickly, started too soon, although they could not establish that definitively from the published case descriptions.

Kettlebell training appears to carry low injury risk when technique is sound and load is progressed sensibly, but the published safety evidence is still thin. The swing in particular is a fast, explosive movement that rewards good technique and punishes improvisation. A hinge that turns into a squat, a grip that slips, a spine that rounds under load at speed, these are what send people to urgent care.

So if you have never done a swing, do one thing before starting the protocol below. Spend one session with a qualified coach. That can be a StrongFirst or Russian Kettlebell Certified instructor, or a physical therapist who works with kettlebells. Most will do a single technique session for the cost of a restaurant meal, and it is the best investment you will make in this equipment. The other moves, goblet squat, press, deadlift, half get-up, are safe to learn from good video instruction if you are otherwise active and pain-free.

Who should not start this protocol

Talk to your physician before starting if any of the following apply to you. Uncontrolled high blood pressure above one hundred sixty over one hundred. A heart attack, stroke, or cardiac procedure in the past six months, or a cardiac condition your physician manages with caution. Uncontrolled or unstable arrhythmia, including untreated atrial fibrillation. Acute or severe back pain, recent spinal injury, or a diagnosed disc herniation. Acute knee, hip, shoulder, or wrist injury, or joint pain that limits daily movement. Pregnancy, especially without prior resistance training. Severe osteoporosis, particularly with a history of vertebral compression fracture. Recent surgery in the past three to six months, including abdominal, pelvic, hernia, or joint replacement. A recent fall not yet evaluated, or new unexplained dizziness or imbalance. Any new or unexplained muscle weakness.

For everyone else, here is how to begin.

Below you will find the full Kettlebell Starter Protocol. The seven foundational movements with beginner-level form cues and video tutorials, a ten-minute routine you can start this week, a simple four-step rule for progressing from one week to the next, a sizing guide for buying your first bell, and a printable one-page worksheet you can keep next to your kettlebell. Everything you need to have your first session in the next seven days. (Also, included is a comprehensive intermediate progression for when the beginner program has been completed.)

Upgrade now for access.

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I’m Dr. Laurie Marbas, board-certified lifestyle medicine physician, and these are the tests I think every adult should know about. We’ll talk about why fasting insulin and HOMA-IR can flag insulin resistance years before fasting glucose ever moves out of normal range. Why ApoB is a more accurate measure of heart disease risk than the LDL cholesterol on your standard lipid panel. Why Lipoprotein(a), or Lp(a), only needs to be tested once in your entire life but rarely is. And why hsCRP, a marker of chronic inflammation, may help explain the half of heart attacks that happen in people with normal cholesterol.

Then we’ll cover the at-home assessments most doctors never do. Grip strength, single-leg balance, walking speed, and the chair sit-to-stand test. Each one is linked to long-term mortality risk in large studies, and each one gets better with practice.

What you’ll learn in this episode:

• The fasting insulin and HOMA-IR test that detects early insulin resistance

• Why ApoB is a better predictor of cardiovascular disease than LDL cholesterol

• How a one-time Lp(a) blood test can change your heart disease risk picture

• What hsCRP reveals about chronic inflammation and heart attack risk

• Four at-home longevity tests, including grip strength and gait speed, that predict healthy aging

• How to talk to your doctor about adding these markers to your next physical
  

Check out the Habit Healers Community: https://www.skool.com/habithealers/about

Dr. Marbas Substack Article: https://drlauriemarbas.substack.com/p/what-are-the-8-tests-your-doctor

In old westerns, something strange happens to stagecoach wheels. As the coach picks up speed, the wheels appear to slow down. Then they stop entirely. Then, if the scene runs long enough, they start spinning backward. The coach is clearly moving forward, but the wheels look like they’ve changed their minds.

The wheels haven’t changed direction. The camera has a problem. Film works by taking still photographs in rapid sequence. If the camera’s frame rate is too slow for the speed of the wheel, it catches each spoke in a position that lookslike the wheel is barely turning. The real motion is fast, but the sampling rate is slow, so the image that reaches the audience is wrong. Engineers have a name for this. They call it aliasing. The signal looks smooth and calm, but only because the measurement tool isn’t fast enough to see what’s actually happening.

Your fasting glucose works the same way.

Every few months, you sit in a chair, extend your arm, and a lab tech draws blood first thing in the morning. The result comes back in the normal range. You feel reassured. Then your A1c arrives, and it’s a little higher than last time. Or a lot higher. Your doctor says to keep an eye on it. You’re confused because the fasting number looked fine.

These two tests aren’t contradicting each other. They’re measuring different things. Fasting glucose is a single frame of a fast-spinning wheel. A1c is more like a film that recorded the whole day, every day, for the past several months. The film is blurry and compressed, but it captured what the snapshot missed.

The question is what’s happening in those invisible hours.

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The Engineer Who Proved Your Blood Draw Isn’t Enough

In the 1940s, a mathematician named Claude Shannon published a proof that changed how engineers think about recording signals. The idea was simple but the implications were enormous. If you want to reconstruct a signal accurately, you need to sample it at least twice as fast as the signal changes. Any slower, and you get aliasing. The reconstructed version of the signal will look different from the real one, and you’ll have no way of knowing.

This idea became the foundation of digital audio, medical imaging, and virtually every system that converts a continuous process into discrete measurements. It also turns out to be directly relevant to glucose monitoring.

A biomedical engineer applied Shannon’s framework specifically to glucose. Using continuous glucose monitor data from people with type 1 diabetes, he analyzed the frequency content of the glucose signal and calculated the minimum sampling rate needed to capture what glucose is actually doing throughout the day. The answer was every 15 minutes. Sampling less often than that, and important dynamics start disappearing from the record.

Think about what that means for a fasting blood draw. You get one measurement every 90 days or so. The math says you need one every 15 minutes. That’s a sampling rate thousands of times slower than what’s required to see the full picture. The fasting number itself is accurate. But a single morning reading was never designed to represent 24 hours of glucose behavior. It captures the calmest moment of the day and treats it as the whole story.

A1c doesn’t have this blind spot in the same way. Hemoglobin A1c reflects the cumulative glucose exposure over the lifespan of your red blood cells, roughly four months, though the measurement is weighted toward the most recent weeks. It has its own limitations (more on that later), but it’s recording the entire performance. That’s why it can see things the fasting number misses.

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Where the Hidden Glucose Lives

So if fasting glucose is capturing the quiet morning and A1c is capturing everything, the gap between them points somewhere specific. And the data are remarkably consistent on where that somewhere is. For people whose A1c is still in the lower range, the overwhelming majority of their total glucose elevation comes not from fasting levels but from what happens after meals.

The most important study on this question, conducted in people with type 2 diabetes, quantified the split. At lower A1c levels, postprandial glucose, the levels your body reaches in the one-to-three-hour window after eating, contributes roughly 70% of the total problem. Fasting glucose accounts for only about 30%. As A1c climbs higher, the ratio reverses. But for the person sitting in the early-warning zone, where fasting looks normal and A1c is creeping upward, the action is happening in that after-meal window.

Follow-up work from the same group found something even more telling. Postprandial glucose control doesn’t deteriorate alongside fasting glucose. It deteriorates first, in a stepwise sequence, with the after-meal window falling apart significantly before nocturnal fasting levels budge at all. By the time fasting glucose begins to move, the postprandial problem has already been building behind the scenes.

The most vivid demonstration of this came when researchers placed continuous glucose monitors on adults whose standard lab work looked completely normal. Even participants classified as normoglycemic by traditional measures spent time in prediabetic and diabetic glucose ranges, reaching prediabetic levels about 15% of the time and diabetic levels about 2% of the time. Participants spiked significantly after a standardized breakfast that no fasting blood draw would have detected.

The largest study of this kind, from a community-based cohort of more than a thousand adults without diabetes, put a finer point on the numbers. When measured against the tighter 70 to 140 mg/dL glucose window, normoglycemic participants spent only 87% of their day in that range. For the remaining 13% of the day, roughly three hours, their glucose was above 140. Among those already classified as prediabetic, time in that same range dropped to 77%, meaning nearly a quarter of their day was spent above 140 mg/dL. Three or more hours a day of elevated glucose, invisible on every fasting draw.

How do you fix it?

Your fasting glucose said you were fine. Your A1c disagreed. The question now is which number you want to change, and how. The paid section includes the labs worth asking for, the ranges your doctor’s report won’t flag, the nine habits that target the hours your blood draw never sees, and a printable worksheet to track it all. Upgrade now to access the full protocol.

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Photographers calibrate their monitors before they edit a single image. If the screen reads colors wrong, every adjustment they make pushes the picture further from reality. They think they’re fixing the white balance, but they’re correcting for a distortion that only exists on their uncalibrated display.

Your sleep works the same way. If you’ve spent years sleeping poorly, your sense of “normal” has drifted. You’ve forgotten what rested actually feels like, so you stop expecting it. You adjust to five and a half hours and accommodate the 3 a.m. wakeup. You build your entire day around afternoon caffeine. And when someone hands you a list of sleep tips (cool room, blackout curtains, no screens before bed) you try them against a miscalibrated system and conclude they don’t work.

They probably didn’t, but the problem wasn’t the tips. The problem was that every one of them targeted the bedroom, and your sleep is mostly built elsewhere. It’s built at breakfast, at 2 p.m. during a walk, and in the bathtub ninety minutes before you lie down.

The seven habits in this article aren’t bedroom tips. They’re calibration tools. Each one operates at a different hour of the day, adjusting a different system in your body so that by the time your head hits the pillow, sleep is already in motion. You’re not chasing it. You’re stepping into something your body spent the whole day preparing for.

One habit per day, Monday through Sunday. By next weekend, you’ll have built a full-day sleep system without buying a single supplement or downloading an app.

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Monday: Eat Protein at Breakfast, Then Step Outside

Race car drivers don’t start at full speed. The warm-up lap brings tires and brakes to operating temperature so the car handles the way it was designed to. Your body runs a warm-up lap too, and most people blow through it with coffee and a cereal bar without realizing they just set the ceiling on tonight’s sleep.

Tryptophan is an amino acid found in protein-rich foods. When you eat it in the morning, your body uses it to make serotonin during the day. Then, approximately fourteen hours later, your brain converts a portion of that serotonin into melatonin, the hormone that makes you sleepy. So the protein on your 7 a.m. plate directly influences how much melatonin your brain produces around 9 p.m. Researchers believe eating protein at dinner doesn’t produce the same effect, because the conversion process needs daytime sunlight exposure to get started.

A controlled trial tested a three-part intervention. Participants ate a tryptophan-rich breakfast, got morning bright-light exposure, and switched to warm-toned (incandescent) lighting in the evening instead of the cool-toned fluorescent lights common in most homes. The group that followed all three steps showed significantly higher evening melatonin and reported better sleep quality. A second study replicated the melatonin finding. The evening lighting component matters because bright, blue-rich light suppresses melatonin production, undoing the work your breakfast started.

The habit is straightforward. Within sixty minutes of waking, eat twenty to thirty grams of protein paired with a food that contains vitamin B6, then spend ten minutes outdoors. B6 matters here because it’s a helper molecule your body needs to convert tryptophan into serotonin. Without enough B6, the pipeline slows down even if you’re eating plenty of protein. The good news is that many foods deliver both tryptophan and B6 in one package, which makes them particularly efficient for this habit. Chickpeas, pistachios, sunflower seeds, and soybeans all hit both targets. If you include animal products, eggs, poultry, and salmon do as well. A chickpea scramble with bell peppers, tempeh on whole-grain toast, or even a smoothie with soy milk and banana will do the job. This one habit pulls triple duty. It preserves muscle mass, stabilizes morning blood sugar, and feeds the raw materials for tonight’s melatonin.

Tuesday: Move Your Workout to Early Afternoon

Most people think of exercise as a way to tire themselves out for sleep. Exercise actually resets your internal body clock, similar to the way sunlight does. And just like sunlight, the time of day you exercise changes which direction the clock shifts.

Think of your body clock like a watch that can be nudged forward or backward depending on when you move. A study tested adults exercising at eight different times of day and tracked how their internal clocks responded. The results showed two windows where exercise pushed the clock earlier (helping you feel sleepy sooner at night), one at 7 a.m. and another between 1 and 4 p.m. Exercise between 7 and 10 p.m. did the opposite, pushing the clock later.

That afternoon window was a surprise, and it has a useful application. If you regularly wake up at 3 a.m. and can’t fall back asleep, that pattern often means your body clock has drifted too early. It’s telling your body that “morning” starts at 3 a.m. In that case, strategically moving one workout to early evening (ending at least sixty minutes before bed) can nudge the clock back toward a more normal schedule. This pattern of too-early waking becomes more common with age and during hormonal transitions.

A meta-analysis found that evening exercise actually increases the deepest stage of sleep and doesn’t appear to cause sleep problems, though a few individual studies suggest that vigorous exercise ending less than an hour before bed may be an exception. And a six-year study tracking adults through midlife found that consistent recreational exercise predicted better sleep measured in a sleep lab. Housework, for the record, did not count.

The habit is to anchor your strength training or brisk cardio to an early afternoon slot two or three times a week. If you’re a 3 a.m. waker, try moving one session to 7 or 8 p.m. to see whether it shifts your wake time later.

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Wednesday: Walk for Ten Minutes After Dinner

The blood sugar spike after dinner is the tallest of the day, and it tends to get taller with age as the body becomes less efficient at processing glucose. When that spike stays elevated into the overnight hours, it activates the branch of your nervous system responsible for stress and alertness during the exact window when your body needs to be winding down. The result is broken sleep, more awakenings, and that 2 a.m. bolt-upright feeling that has nothing to do with a bad dream.

There’s also a direct collision happening between blood sugar and the sleep hormone itself. Melatonin and insulin are designed to take turns. Your pancreas actually has melatonin receptors on it, and when melatonin rises in the evening to prepare you for sleep, part of its job is telling the pancreas to quiet down. But if blood sugar is still elevated from dinner, the pancreas has to keep producing insulin to deal with it. That insulin activity interferes with melatonin doing its job. The two systems end up working against each other at the exact moment they’re supposed to be handing off the night shift.

A randomized trial tested whether the timing of walking mattered for blood sugar control in older adults at risk for blood sugar problems. Three fifteen-minute walks (one after each meal) outperformed a single forty-five-minute walk for all-day blood sugar control, and the after-dinner walk made the biggest difference of the three. Large studies using continuous glucose monitors have since confirmed that sleep quality and blood sugar regulation feed into each other. Poor sleep spikes next-day blood sugar, and high evening blood sugar breaks up tonight’s sleep. The loop reinforces itself, and the after-dinner walk interrupts it.

Research also suggests that eating close to bedtime increases the likelihood of waking up during the night, regardless of what you eat. So the after-dinner walk serves a double purpose. It blunts the blood sugar spike AND it creates a natural boundary between dinner and bed.

The habit is a brisk (not strenuous) walk for ten to fifteen minutes within thirty minutes of finishing dinner. It also helps to finish your last meal well before bedtime, giving your body time to process the glucose before you lie down.

Thursday: Take a Hot Bath Ninety Minutes Before Bed

This one sounds like standard advice, but the mechanism runs backward. The bath doesn’t relax you into sleep so much as it tricks your body’s thermostat.

When you sit in hot water (about 104 to 109°F), blood vessels in your hands and feet open wide. That’s your body trying to release excess heat through your extremities. When you step out of the tub, those blood vessels stay open, and your core body temperature drops rapidly, faster than it would on its own. That accelerated drop mimics and amplifies the natural temperature decline your brain uses as a “go to sleep” signal. Your brain reads the falling temperature and begins the cascade toward drowsiness.

A large meta-analysis found that a warm bath or shower at this temperature range, taken one to two hours before bed, significantly cut the time it took people to fall asleep. The timing window turned out to matter more than how long you stayed in the water. The one-to-two-hour pre-bed window was significantly more effective than bathing earlier or later. And as little as ten minutes in the water was enough to trigger the response.

A separate large study of over a thousand older adults confirmed the link between pre-bed bathing and faster sleep onset.

The habit is a bath or shower at 104 to 109°F for at least ten minutes, finishing roughly ninety minutes before lights out.

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Friday: Put On Socks Before Bed

This is the companion to Thursday’s bath, running the same temperature mechanism all night long instead of just triggering it once.

Your brain uses the temperature difference between your extremities and your core as one of its strongest “time to sleep” signals. When your feet are warm and your core is cool, that gap is wide, and your brain reads it as a green light for sleep. When your feet are cold, the gap narrows, and the signal stalls.

This matters more than you might expect, especially as you get older. Circulation to the extremities tends to decrease with age, and cold feet at bedtime are a surprisingly common complaint. If your feet are cold when you lie down, you’re not just uncomfortable. You’re working against the same temperature system the hot bath was designed to activate.

A sleep lab study found that wearing loose, breathable socks throughout the night helped people fall asleep faster, wake up less often, and sleep more efficiently by keeping blood flowing to the feet all night. The study was small, but the underlying temperature mechanism is well-established from larger research on pre-bed bathing. The socks keep the radiators open, your core stays cool, and the temperature gap stays wide all night.

If you’re stacking Thursday’s bath with Friday’s socks (and you should), the sequence is simple. Take your bath at ninety minutes before bed, then pull on the socks immediately after. You’ve triggered a rapid core temperature drop AND locked in the temperature gap for the full night.

Saturday: Five Minutes of Breathing Before Bed

Two techniques, one goal. Both activate the vagus nerve, the long nerve running from your brain to your gut that acts as the body’s “calm down” switch. When the vagus nerve fires, your heart rate slows, your blood pressure drops, and your nervous system shifts from alert mode into rest mode. Pick the technique that appeals to you, or alternate between them on different nights.

The first is cyclic sighing. You take a normal inhale through your nose, then immediately take a second short “top-up” inhale to fully expand your lungs. Then a long, slow exhale through pursed lips, roughly twice the length of the inhale. That double inhale opens up more of the tiny air sacs in your lungs, and the extended exhale clears carbon dioxide efficiently, which rapidly lowers your body’s stress response. A head-to-head randomized trial tested cyclic sighing against box breathing, cyclic hyperventilation, and mindfulness meditation over twenty-eight days using wearable trackers. When the four techniques were compared individually, cyclic sighing was the one that significantly reduced resting breathing rate, a direct sign that the “calm down” branch of the nervous system was taking over, and it produced the largest mood improvement. That said, the study did not find direct improvements in sleep metrics. What it did find was a measurable shift in the nervous system toward the state your body needs to be in for sleep to happen. The logic is that if your nervous system is still running in alert mode at bedtime, no amount of darkness or quiet will override that signal.

The second technique is humming on the exhale. Inhale deeply through the nose, then exhale through the nose while making a low-pitched, closed-lip “mmmmm” for the entire exhale (about six to eight seconds). The vibration from the hum stimulates the vagus nerve through the tissues of the throat. It also dramatically increases nitric oxide in the nasal passages while you’re doing it, a molecule that opens blood vessels and improves nasal airflow. A heart monitoring study found that humming produced lower stress markers and a more relaxed heart rhythm than natural sleep itself, which is a genuinely unusual finding.

The habit is five minutes of either technique, sitting or lying down, immediately before lights out.

Sunday: Write Tomorrow’s To-Do List

Your brain treats unfinished tasks the way a computer treats open applications. They keep running in the background, using up processing power, keeping a low level of mental alertness going that interferes with falling asleep. Psychologists call this the Zeigarnik effect, named after the researcher who first showed that unfinished tasks stick in memory better than completed ones. At bedtime, those open loops keep the planning part of your brain in “go” mode when it needs to be shutting down.

A sleep lab study randomly assigned healthy young adults to spend five minutes writing before bed. One group wrote a specific to-do list for the next few days. The other group wrote about activities they had already completed that day. The to-do list group fell asleep significantly faster, taking roughly nine minutes less to fall asleep than the other group. But the more interesting finding was the pattern within the to-do list group. The more specific and detailed the list, the faster the person fell asleep. Vague lists didn’t help much. Concrete lists (not “deal with work stuff” but “email Maria about the budget, call the dentist for a cleaning, pick up the prescription at CVS”) produced the fastest results.

But writing about what you already accomplished that day, which most people would expect to feel satisfying and calming, didn’t help at all. That group took significantly longer to fall asleep than the to-do list group. Looking back at finished tasks seems to restart mental activity rather than quiet it.

The habit is five minutes, immediately before lights out, writing a concrete and specific to-do list for tomorrow and the days following. Place the notebook on your nightstand and resist the temptation to journal about what you did today.

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The Through-Line

Look back at the seven days and you’ll notice a pattern. Monday’s habit operates at 7 a.m., Tuesday’s at 2 p.m., Wednesday’s right after dinner, Thursday and Friday in the hour before bed, and Saturday and Sunday in the last five minutes before lights out. None of them fight insomnia at the point of insomnia. Every one of them shapes a system in your body (melatonin, your internal clock, blood sugar, core temperature, stress response, mental load) hours before the moment you actually need to fall asleep.

This is the concept professional kitchens call mise en place. Before the flame goes on, everything is prepped and placed. Vegetables chopped, sauces measured, plates stacked and ready. When the dinner rush hits, the chef isn’t scrambling for ingredients. The work was already done.

Your sleep works the same way. If you try to manufacture sleep at 10 p.m. by lying in a dark room and hoping for the best, you’re cooking without prep. But if you’ve eaten protein at breakfast, walked in the afternoon sun, taken a post-dinner stroll, soaked in a hot bath, and pulled on a pair of socks, your body has already laid the groundwork. Sleep becomes something you step into rather than something you chase.

Try one habit per day this week. By Sunday night, you’ll have the full system in place. See what happens. Worksheet below.

Seven Unusual Sleep Habits

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P.S. Speaking of sleep, I recently got a new mattress from Helix. They sent me their Midnight Luxe and I’ve been genuinely enjoying it. They have this sleep quiz on their site that matches you with the right mattress based on how you sleep, and I thought it was actually well designed. If you’ve been thinking about a new mattress, it’s worth taking. Full disclosure, I do have an affiliate link, so if you end up buying through it I receive a small commission. But I’d mention the mattress either way because it’s been a real upgrade for me. Take the Helix Sleep Quiz now.

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References:

1. Wada K, Yata S, Akimitsu O, et al. A tryptophan-rich breakfast and exposure to light with low color temperature at night improve sleep and salivary melatonin level in Japanese students. J Circadian Rhythms. 2013;11:4. Published 2013 May 25. doi:10.1186/1740-3391-11-4

2. Fukushige H, Fukuda Y, Tanaka M, et al. Effects of tryptophan-rich breakfast and light exposure during the daytime on melatonin secretion at night. J Physiol Anthropol. 2014;33(1):33. Published 2014 Nov 19. doi:10.1186/1880-6805-33-33

3. Youngstedt SD, Elliott JA, Kripke DF. Human circadian phase-response curves for exercise. J Physiol. 2019;597(8):2253-2268. doi:10.1113/JP276943

4. Stutz J, Eiholzer R, Spengler CM. Effects of Evening Exercise on Sleep in Healthy Participants: A Systematic Review and Meta-Analysis. Sports Med. 2019;49(2):269-287. doi:10.1007/s40279-018-1015-0

5. Kline CE, Irish LA, Krafty RT, et al. Consistently high sports/exercise activity is associated with better sleep quality, continuity and depth in midlife women: the SWAN sleep study. Sleep. 2013;36(9):1279-1288. Published 2013 Sep 1. doi:10.5665/sleep.2946

6. DiPietro L, Gribok A, Stevens MS, Hamm LF, Rumpler W. Three 15-min bouts of moderate postmeal walking significantly improves 24-h glycemic control in older people at risk for impaired glucose tolerance. Diabetes Care. 2013;36(10):3262-3268. doi:10.2337/dc13-0084

7. Tsereteli N, Vallat R, Fernandez-Tajes J, et al. Impact of insufficient sleep on dysregulated blood glucose control under standardised meal conditions. Diabetologia. 2022;65(2):356-365. doi:10.1007/s00125-021-05608-y

8. Haghayegh S, Khoshnevis S, Smolensky MH, Diller KR, Castriotta RJ. Before-bedtime passive body heating by warm shower or bath to improve sleep: A systematic review and meta-analysis. Sleep Med Rev. 2019;46:124-135. doi:10.1016/j.smrv.2019.04.008

9. Tai Y, Obayashi K, Yamagami Y, et al. Hot-water bathing before bedtime and shorter sleep onset latency are accompanied by a higher distal-proximal skin temperature gradient in older adults. J Clin Sleep Med. 2021;17(6):1257-1266. doi:10.5664/jcsm.9180

10. Ko Y, Lee JY. Effects of feet warming using bed socks on sleep quality and thermoregulatory responses in a cool environment. J Physiol Anthropol. 2018;37(1):13. Published 2018 Apr 24. doi:10.1186/s40101-018-0172-z

11. Balban MY, Neri E, Kogon MM, et al. Brief structured respiration practices enhance mood and reduce physiological arousal. Cell Rep Med. 2023;4(1):100895. doi:10.1016/j.xcrm.2022.100895

12. Trivedi G, Sharma K, Saboo B, et al. Humming (Simple Bhramari Pranayama) as a Stress Buster: A Holter-Based Study to Analyze Heart Rate Variability (HRV) Parameters During Bhramari, Physical Activity, Emotional Stress, and Sleep. Cureus. 2023;15(4):e37527. Published 2023 Apr 13. doi:10.7759/cureus.37527

13. Weitzberg E, Lundberg JO. Humming greatly increases nasal nitric oxide. Am J Respir Crit Care Med. 2002;166(2):144-145. doi:10.1164/rccm.200202-138BC

14. Scullin MK, Krueger ML, Ballard HK, Pruett N, Bliwise DL. The effects of bedtime writing on difficulty falling asleep: A polysomnographic study comparing to-do lists and completed activity lists. J Exp Psychol Gen. 2018;147(1):139-146. doi:10.1037/xge0000374

In the early twentieth century, a French physician and chemist named Louis-Camille Maillard noticed something that would explain a lot about cooking and a surprising amount about aging. He found that when sugars react with proteins, a chain of chemical events produces browning, new flavors, and lasting changes in the protein. This is why bread crusts brown, why a steak develops a seared crust, and why roasted coffee gets its color.

Decades later, researchers studying diabetes realized that a version of this same reaction was happening inside the human body. Not at cooking temperatures, but slowly, over years, wherever glucose in the bloodstream came into contact with long-lived proteins. The downstream products of this reaction are called advanced glycation end products, or AGEs. Some AGEs are surface modifications on protein fibers. Others form cross-links between fibers, stiffening them and making them resistant to the body’s normal recycling.

The structural result is strikingly similar to what happens when a tanner converts animal hide into leather. Leather tanning uses different chemistry, but the end point is the same. The collagen fibers get cross-linked, the tissue stiffens, and it becomes resistant to breakdown. In a tannery that transformation takes hours; in your skin it takes decades.

Your body makes collagen constantly. It is the scaffolding of your dermis, the structural layer underneath the surface. When collagen fibers are young, they are flexible and organized, which is why young skin bounces back when you press on it. But by around age twenty, glycated collagen becomes detectable in skin. Glucose molecules attach to collagen fibers and trigger a slow chemical cascade that produces AGEs. The major cross-links, particularly one called glucosepane, appear unusually persistent in human tissue. They accumulate steadily across decades, and by middle age a meaningful fraction of your dermal collagen has been permanently stiffened.

This is one of the key processes that produces sagging and wrinkles from the inside. Not all skin aging is sun damage. A comprehensive review documented how AGEs build up in human skin over decades, cross-linking collagen and elastin fibers. The cross-linked collagen becomes resistant to the enzymes that would normally break it down, so old, stiffened collagen stays in place while new collagen production slows and the structural damage compounds year after year. Just as cross-linked collagen in leather resists degradation, cross-linked collagen in your face resists the body’s attempts to renew it.

Most people assume skin aging is primarily about sun exposure or genetics, but the blood sugar data tells a different story.

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Researchers photographed the faces of 602 adults and had independent panels estimate their age. Then they measured each person’s blood glucose levels, and the relationship was significant. Among non-diabetic participants, every 1 mmol/L increase in blood glucose (roughly 18 mg/dL) was linked to appearing about 0.4 years older. This held after adjusting for age, sex, BMI, smoking, and sun damage. Participants with diabetes, who represent the long-term extreme of glycation exposure, looked oldest of all. Your blood sugar level appears to be writing itself onto your face, one cross-link at a time.

Separate research has used a technology called skin autofluorescence to measure AGE deposits directly. The device shines light on the skin and reads the fluorescent signal that accumulated AGEs emit. In one study of people with type 1 diabetes, the results tracked best with blood sugar control over roughly five to fifteen years. Your skin, in other words, keeps a chemical record of your glucose history.

Most of what gets sold as skin care targets the surface. Moisturizers and serums and exfoliants all address the outermost layer, the stratum corneum, which thickens and dries with age. But the structural collapse, the actual sagging and loss of elasticity, happens one layer deeper, in the dermis, where collagen and elastin live. And a major driver of that collapse may have as much to do with what you eat as what you put on your skin.

What the Research Actually Shows

Multiple lines of research now show this process can be measurably slowed and, in some cases, partially improved. The interventions that work are not the ones most people would expect. One of them directly contradicts one of the most popular supplement trends of the past decade.

The cross-linking is happening right now, in your skin, in the dark, whether you know about it or not. What you do next is the variable you control.

Upgrade now to access the 30-Day Skin Rebuilding protocol, the research behind it, and a printable 30-day tracker are waiting for you below.

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Read more

Some of these will surprise you. Sleep regularity, meaning how consistent your bedtime and wake time are from day to day, may predict all-cause mortality better than total sleep duration. Weekend recovery sleep can make insulin sensitivity worse, not better. Evening exercise does not ruin your sleep. A glass of wine is dismantling your sleep architecture even when it feels like it’s helping you drift off. And women are dramatically underdiagnosed with sleep apnea because the classic stereotype tells the wrong story.

I’m Dr. Laurie Marbas, a board-certified lifestyle medicine physician, and in my practice I see how much suffering comes from following outdated sleep advice. This episode replaces myth with mechanism so you can build a sleep routine that actually works.

What you’ll learn:

• Why sleep regularity may matter as much as total sleep hours for longevity and brain health

• The truth about weekend catch-up sleep and your circadian rhythm

• Why melatonin is a chronobiotic, not a sleeping pill, and when to actually use it

• How sleep apnea presents differently in women and lean adults

• What CBT-I is and why it outperforms medication for chronic insomnia

• Why hitting snooze is probably fine, and the one habit to start Monday

Dr. Marbas Substack Article: https://drlauriemarbas.substack.com/p/how-many-of-these-14-sleep-myths

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