A juvenile detention center that swapped processed meals for whole foods saw violent incidents drop by 97 percent, a striking sign that ADHD-like behavior can be driven as much by the gut as by the brain.

• What to do: Rebuild breakfast around protein, fat, and fiber, and cut ultra-processed food, added sugar, and artificial dyes, which controlled studies link to worse behavior.
• Why it matters: About 60% of the immune system lives in the gut, and gut bacteria produce roughly a third of the metabolites circulating in blood, so an imbalanced microbiome can directly disrupt dopamine, serotonin, and GABA production.
• How to apply it: Ask a functional medicine practitioner for stool testing, food sensitivity panels, and nutrient labs (magnesium, zinc, B6, folate, omega-3s) instead of starting with a stimulant alone.
• Metrics: Function Health data shows over 70% of people tested have at least one true nutrient deficiency; prison studies found a daily multivitamin cut violent behavior by up to 80%.
• Risks: Antibiotic overuse, C-section birth, and low breastfeeding rates are linked to disrupted infant microbiomes that raise later ADHD risk.

Mark Hyman went into his sixth back surgery septic, 25 pounds down, and with a 5 to 10 percent chance of surviving the operation, then rebuilt 25 pounds of muscle in eight or nine months at age 65 by treating recovery as non negotiable.

• What to do: Put the foundations first: high protein, creatine, anti inflammatory foods, microbiome work with prebiotics and probiotics, sleep, and daily physical therapy even if it is lying on the floor with a band. Move every day and never let more than two days pass without exercise.
• Why it matters: Every system in Hyman's body collapsed with mercury driven chronic fatigue, and failed again after sepsis. Recovering at 65 showed the body repairs at any age given the right inputs, and that over indexing on peptides or red light over food, exercise, and sleep is a waste of money.
• How to apply it: Use cold plunges for inflammation and focus, but never right after training; sauna a couple of 15 minute rounds most days; red light panel about 20 minutes; glucose monitor only if you have metabolic problems; measure biological age with the same clock each time and watch the change, not the absolute number.
• Metrics: six surgeries, five in six years; lost half his blood volume; slept four hours a night for six weeks; biological age 10 years older after surgery and 10 years younger the following year; 93 percent of Americans in poor metabolic health; Function Health runs 160 blood tests for 365 dollars a year.
• Tools: creatine, vitamin D, Magnesium Breakthrough, Timeline Mitopure, Rho Nutrition Liposomal NAD, Sunlighten infrared sauna, red light panel, IV therapy, Function Health, the book The UltraMind Solution.
• Risks: metformin inhibits mitochondrial complex I and blocks muscle gain from strength training; IV vitamin C is dangerous with G6PD deficiency; peptides have little human data and circulate through gray and black markets.

Without an ApoB particle depositing cholesterol in the artery wall there is no atherosclerosis: it is the necessary substrate, and the single worst gene variant raises cardiovascular risk by under 50 percent while high blood pressure, smoking, or diabetes each multiply it by two to four.

• What to do: Get an Lp(a) once in a lifetime and add an ApoB to your standard lipid panel, along with blood pressure and waist size. If you have high ApoB with a bad family history, consider a low dose statin plus ezetimibe even if imaging shows no plaque.
• Why it matters: Lowering ApoB and LDL cuts events in every trial, and kept cutting them going from 70 to 15 mg/dL. Lower for longer is better, and treatment intensity should match plaque burden.
• How to apply it: Use the PREVENT calculator, which now covers ages 30 to 79 and gives a 30 year risk. A calcium score only sees calcified plaque and coronary CT angiography detects more; a clean coronary does not rule out plaque elsewhere. Re-evaluate yearly and repeat imaging in three to seven years.
• Metrics: physiologic ApoB below 40 to 50 mg/dL, the level we are born with; a threshold of about 5,000 mg/dL years of accumulated LDL cholesterol; example of taking ApoB from 90 to 60 with a low dose statin and ezetimibe; hazard ratio of the worst gene below 1.5.
• Tools: standard lipid panel, ApoB, Lp(a), PREVENT calculator, coronary calcium score, coronary CT angiography, Life's Essential 8, statins, ezetimibe, PCSK9 inhibitors, bempedoic acid.
• Exceptions: you can live to 120 with an untreated LDL of 300 mg/dL and never have an event; the isolated number predicts mainly at the extremes, not in the middle range where most people sit.

Mitochondria do not only make ATP: they decide how a cell splits its fuel between staying itself and making more of itself, and when a heart cell tips that balance toward growth it enlarges and fails.

• What to do: Treat your body as a constellation of cellular metabolisms, not a single metabolism. Avoid chronic excess calories, which overpower mitochondria, and use exercise to raise energy demand rather than leaving the system overloaded at rest.
• Why it matters: An overpowered mitochondrion generates reactive oxygen species that damage the genome and proteins and contribute to mutations, disease, and aging. When cells devote too much energy to growing rather than functioning, you get the enlarged heart that will not pump, cancer, and inflammatory disease.
• How to apply it: Remember that mitochondria are inherited only from the mother and carry their own genome; local ATP production is why exercise and the use of each tissue shape their function. The mitochondrial pyruvate carrier, MPC1 and MPC2, is a key decision point for the fate of glucose.
• Metrics: neurons with projections up to a meter long that mitochondria travel along; the IGF-1 growth pathway links larger size to shorter lifespan within a species; sprinters and gymnasts outlive very large athletes by about 3 to 6 years on average.
• Risks: excess energy at the front end, the energy toxicity described by Layne Norton, does harm beyond stored fat; mutations accumulate with age, and by 50 each person is a mosaic of their original genome and mutated cells.

The most useful lesson from 25,000 patients is that fasting insulin predicts the future: a level above 15 flags type 2 diabetes 5 to 15 years ahead, and it usually has to fall to around 10 before stored fat comes off.

• What to do: Ask your doctor for a fasting insulin test, not just glucose or A1C. Build meals around animal protein and animal fat so satiety hormones switch on. Keep the diet monotonous for 90 days if you have severe metabolic disease.
• Why it matters: Fasting insulin reveals fatty liver, hypertension, metabolic syndrome, and diabetes up to a decade before diagnosis. Hunger is a biological drive that always overrides willpower, so diets that fail to satisfy fail regardless of discipline.
• How to apply it: Track a tailor's tape and lab numbers instead of the scale, which moves last. Treat a drop from 40 to 30 in fasting insulin as progress. Add only salt and mild spice during the reset, then reintroduce variety once triglycerides, HDL, inflammation, and blood sugar improve.
• Metrics: Fasting insulin above 15 predicts diabetes; target near 10 to lose fat; 40 is severe; 90 day boring diet window.
• Tools: Fasting insulin panel, tailor's tape measure, the Proper Human Diet community for coaching and support.

Emeran Mayer reframes the gut microbiome as a transducer that converts diet, stress, and toxins into the body's chemical language, and estimates that a third to a half of the roughly 6,000 metabolites in your blood originate there.

• What to do: Eat 30 to 35 different plants a week, split across a varied bowl in the morning and a complex salad at night, prioritize prebiotic fiber, polyphenols, and naturally fermented foods, and cut ultra processed food.
• Why it matters: Microbes produce anti inflammatory short chain fatty acids like butyrate, and the balance between those and pro inflammatory molecules decides an organ's health, the brain included. About 60 percent of the American diet is ultra processed and damages the microbiome directly.
• How to apply it: Add garlic, onion, leek, asparagus, legumes, cooked and cooled potato or rice, and green banana daily for fiber; cranberry, pomegranate, and green tea for polyphenols; sauerkraut, kimchi, and kefir for ferments. Work on sleep, exercise, purpose, and community gradually too.
• Metrics: about 40 trillion gut bacteria; a third to a half of roughly 6,000 blood metabolites are microbial; Alzheimer's and Parkinson's changes visible in the microbiome from the 40s; the best stool tests are still limited.
• Tools: prebiotic and polyphenol foods, naturally fermented foods, Seed DS-01 Daily Synbiotic, the book The Mayer Model.
• Risks: emulsifiers, artificial sweeteners, ultra processed food, early antibiotics, and C sections damage the microbiome; probiotics alone barely reshape it.

What decides how much glucose a muscle takes up is what it did in the last day or two, not how big it is: in the 1989 Copenhagen study the exercised leg took up more glucose than the rested leg of the same man, and the effect was gone by day five.

• What to do: Train strength two or three days a week and add cardio sessions, because recent contraction installs glucose transporters with or without insulin. Eat about 1.5 grams of protein per kilogram, and if you carry excess fat, run a calorie deficit to move it out of the liver and muscle.
• Why it matters: In 18,800 older adults, DEXA lean mass predicted none of falls, fractures, mobility, or death, while grip strength and gait speed predicted all four. Gaining muscle is neither necessary nor sufficient to improve blood sugar.
• How to apply it: One 45 minute elliptical session tripled where carbohydrate went into muscle and cut new liver fat by 30 percent with no muscle built. The effect lasts about 48 hours, so frequency matters more than accumulating tissue.
• Metrics: muscle glycogen 61 percent lower in insulin resistant people; blood triglycerides 60 percent higher; HDL 20 percent lower; sarcopenic obesity from 49 to 33 percent with fat loss alone; exercise effect absent by day five.
• Tools: resistance training, endurance cardio, protein sufficient meals, the Barbell Medicine hybrid 5K and 10K running program.
• Risks: losing muscle while losing weight is real and matters more the less muscle you start with; resistance training prevented about 93 percent of that loss in older adults with obesity.

A large randomized trial of the free Healthy Minds Program app found that 5 minutes a day for 28 days significantly lowered the inflammatory marker interleukin 6, produced a stronger flu vaccine antibody response and shifted the gut microbiome toward the butyrate pathway, with effects still present at 6 months.

• What to do: Pair mental training with exercise you already do, reflecting as you lace up on how the workout benefits everyone in your life, then anchoring attention to body sensations during the session.
• Why it matters: Vigorous aerobic exercise is the best validated way to raise neuroplasticity, but plasticity is neutral and encodes whatever fills your mind, so training while consuming angry news makes things worse.
• How to apply it: Practice the four pillars, awareness, connection, insight and purpose, about 5 minutes a day and consistently, since active practice during chores or a commute works as well as formal seated meditation.
• Metrics: In adults 70 and older a strong sense of purpose is the single best psychological predictor of longevity, and the 2023 US Surgeon General advisory rated loneliness a larger premature mortality risk than smoking 15 cigarettes a day.
• Exceptions: The first week of practice often increases anxiety because you start to notice how chaotic your mind is, and it usually drops below baseline after about a week.

If you normally sleep at ten and go to bed at one, you do not delay the night's largest growth hormone pulse or the brain's protein cleanup, you lose them, because each cell's clock has already moved to the next phase.

• What to do: Keep a bedtime as consistent as your wake time and protect the first slow wave cycle. Arrive in bed calm with slow breathing or a warm bath, and without alcohol, which suppresses REM.
• Why it matters: The first slow wave stretch brings the large growth hormone pulse and the protein synthesis that fixes memories, and runs the washout that clears misfolded proteins. REM shuts off the locus coeruleus and so separates emotion from a memory; without that step trauma stays fresh.
• How to apply it: Set alarms to multiples of about 90 minutes so you do not wake mid cycle and hit sleep inertia; waking from REM rarely causes problems. After a hard day, calm the sympathetic nervous system before bed rather than reactivating the emotion by talking it through.
• Metrics: cycle about 90 minutes, the first longer at roughly 105 to 110; four or five cycles a night; seven and a half to eight hours total; spindle density correlates with intelligence and almost perfectly with consolidation; trackers stage sleep about 70 percent correctly.
• Tools: sleep tracker with reservations, slow breathing, meditation, warm bath, calm reading.
• Risks: alcohol before bed worsens sleep until it is metabolized; talking through a trauma while still activated proved counterproductive in studies.

Two mental bodyguards block change. One guards your energy by keeping roughly 11 million of your thoughts on autopilot, and one guards your ego, and a study found people value affirmation of a treasured identity more than their favorite food or time with a friend.

• What to do: End each day with two questions, what did I learn and did I try my best, instead of what did I get right or wrong, to avoid the learned helplessness that comes from feeling like a failure.
• Why it matters: Change feels like the Stroop test because it requires unlearning first, letting go of the known before learning the new, so demanding instant change from others ignores how hard it was for you.
• How to apply it: You can model, invite and reward change but not force it, so use pull over push, make your own struggles visible, and recognize tiny attempts rather than correcting them.
• Tools: Run the WAIT rule, why am I talking, and ask whether someone wants to be heard, hugged, helped or high fived, since about 90 percent want to be heard, and give feedback as specific behavior plus expectation plus impact rather than adjectives.
• Exceptions: When someone is not ready to change and your support is only propping up the dynamic, the one remaining move is to step out of it.