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Pear Health Lab
TOPICS
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The core topics of longevity and health, organized by category in plain language for people who are not researchers.
01 · exercise
Exercise
Four pillars of a powerful longevity tool
Exercise Overview: Why Moving Is a Powerful Longevity Tool
Heart-lung fitness and muscle are two of the strongest longevity levers: where views agree, differ, and how firm the evidence is.
12 minStrength and Muscle Mass: A Reserve You Still Want at 90
After midlife, muscle and strength slip yearly; strength predicts lifespan better than size, and resistance training works at any age if you start and stay.
12 minStability: The Foundation Under Every Other Workout
Stability is the base under strength and aerobic work. Balance and functional training have the firmest fall evidence later in life; no method is settled.
12 minZone 2: The Slow Build of a Metabolic Engine
Zone 2 is easy to start and recover from, a way to build aerobic volume. It is a base, not a fix-all, and scarce time calls for some higher intensity too.
13 minVO2 Max and Hard Efforts: The Ceiling of Heart and Lungs
Cardiorespiratory fitness is among the trainable measures most tied to lifespan. Intervals raise the ceiling best, on top of easier work.
13 minThe Centenarian Decathlon: Train Backward From Late Life
Name what you still want to do late in life, then train backward. The frame helps, but the specific numeric targets have not been tested.
13 minA Week of Training: Fitting the Four Pillars Into Real Days
Fit stability, strength, an aerobic base, and hard efforts into the week: hit the volume floor first, then match intensity to the hours you have.
12 minExercise, Brain, and Mood: Why Moving Can Clear the Mind
Exercise can lift alertness at once and ease depressive symptoms moderately, but it is not the same as medication; experts differ on the mechanism.
12 min02 · nutrition
Nutrition
Ask about metabolic health, not which diet wins
Nutrition Overview: From Weight Loss to Metabolic Health
Nutrition's goal is not only the number on the scale, but whether glucose, lipids, and the liver—the metabolic system—are working well.
12 minProtein: Many People Eat Less Than Their Body Uses
Official targets only prevent deficiency, not muscle loss; the views favor enough protein plus strength training, and differ on how high and how to split it.
12 minBody Composition and DEXA: What Weight and BMI Leave Out
Weight and BMI cannot separate muscle from fat; watch waist, visceral fat, and muscle, and aim to lose fat while keeping muscle.
12 minMetabolic Health and Glucose: How Insulin Resistance Begins
Insulin resistance often starts in muscle years before glucose rises; exercise, sleep, weight loss, and fewer sugary drinks are the firmest levers.
13 minFasting and Time-Restricted Eating: A Tool, Not a Creed
Fasting helps people with higher weight eat less. At the same calories the extra fades; lifespan data are mostly from animals, and muscle loss is the risk.
13 minKetosis and Low Carbohydrate: What Changes When Fuel Shifts
Ketosis is a natural fuel switch, not a fat-loss trick. Epilepsy has evidence; adherence drives weight loss; watch lipids; diabetes means asking a clinician.
13 minAlcohol: A Rare Point of Broad Agreement
Once study bias is corrected, light drinking's health upside mostly disappears. Views agree that less is better, and differ on the risk of a little.
13 minCaffeine: Timing, Amount, and What It Does to Sleep
Caffeine blocks adenosine to sharpen alertness; coffee's link to lower death risk is observational, while thinner sleep has trial support—timing matters more.
11 minNicotine and Cannabis: The Bill for Brain and Body
Smokers live at least ten years less and quitting earlier helps; cannabis links to psychosis and heart risk are growing, and THC's sleep aid later backfires.
11 minUltra-Processed Food, Sugary Drinks, and Salt
Sugary drinks have the clearest evidence; ultra-processed food drives overeating, cause unsettled; less salt lowers blood pressure, and needs differ.
12 minGut Health: The Gut Wall, Short-Chain Fats, and Microbes
Gut health rests on an intact wall and well-fed bacteria; fiber has the firmest evidence, probiotics only in specific cases.
12 minPlant Compounds: Polyphenols, Sulforaphane, and Carotenoids
Eating a wide mix of plants tracks with lower risk. Once isolated as supplements, most compounds fail in trials, and beta-carotene harms people who smoke.
12 min03 · sleep
Sleep & Circadian Rhythm
The repair program the body runs each night
Sleep Overview: Why Sleep Is Longevity Infrastructure
Sleep files memory, tunes metabolism, and clears the brain; short and irregular sleep track with death risk, and labs show lost sleep changes metabolism.
12 minSleep Hygiene: Practices You Can Start Today
A fixed schedule, morning light, dim evenings, a cool room, earlier caffeine, and less alcohol are the base. Chronic insomnia needs behavioral therapy.
12 minLight and Circadian Rhythm: The Clock Behind the Eyes
Bright days, dim evenings, and a regular schedule set the body clock; minute counts are rules of thumb, and long-term benefit evidence is still soft.
12 min04 · mind
Mind, Mood & Brain
A long life also has to be a life you want
Emotional Health: The Overlooked Part of Healthspan
Emotional health is central to living well and tied to lifespan. Sleep, movement, and relationships are the base; professional care is an ordinary choice.
12 minStress and the Nervous System: Coming Back From Strain
Stress is a whole-body response, not only a mood; chronic strain touches immunity and the heart, and breath, exercise, and thought can lower arousal.
12 minMindfulness, Meditation, Breathwork, and NSDR
Breathwork shifts autonomic tone, meditation trains attention, NSDR is deep rest while awake. A few minutes starts it; measurable, not a substitute for care.
11 minTrauma and Therapy: From Experience to Repair
Trauma exposure is common, not rare. Most people are resilient; those who need help have trauma-focused therapy. Psychedelics remain under study and regulation.
11 minRelationships and the Skill of Reading Emotion
Relationship quality tracks with lifespan and heart risk; emotional skill can be practiced, and loneliness matters more than how many people are nearby.
10 minHappiness and Quality of Life: Marks of Living Well
Well-being splits into in-the-moment feeling and a life rating. Money's effect varies; relationships outlast income; gratitude and purpose can be practiced.
10 minNeuroplasticity, Learning, and Memory
The adult brain stays plastic but takes active effort; exercise, sleep, spaced practice, and curiosity align, with BDNF a candidate go-between.
11 minFocus and ADHD: Attention as a Trainable Skill
ADHD is a neurodevelopmental difference, not laziness; fewer task switches, rhythmic work, and exercise have support, and medication belongs with a specialist.
11 minMotivation, Willpower, and How Habits Form
Willpower is not a battery you can trust; what holds is environment, habit, and goal structure, plus practice at hard things.
10 minCreativity: How the Brain Arrives at a New Idea
Creativity is trainable: separate idea-making from selection, let walking and REM sleep connect ideas, and keep dopamine mid-range.
10 min05 · hormones
Hormones & Sexual Health
Reading the body's chemical messengers
Hormone Overview: Thyroid, Cortisol, and Sex Hormones
Hormones are messengers: thyroid runs metabolism, cortisol the daily rhythm, sex hormones reproduction and immunity. Lifestyle before tests.
10 minMale Health and Testosterone Across Adult Life
Testosterone is more than sex. Diagnosis: symptoms plus two morning labs. Obesity can reverse. Heart events match placebo; erectile trouble is a vascular alarm.
11 minFemale Health: Cycle, Perimenopause, and Menopause
Perimenopause can start 7–10 years before menopause, with no single blood test; hormone therapy depends on timing, and strength plus nutrition are the base.
12 minHormone Replacement: Evidence, Debate, Questions for a Clinician
It relieves menopause symptoms best; the debate is risk, a ten-year window, and weighing the tradeoffs with a clinician.
10 min06 · risks
Chronic Disease Prevention
Four disease groups behind most lost years
The Four Horsemen: Most Deaths Trace to Four Chronic Diseases
Atherosclerosis, cancer, neurodegeneration, and metabolic disease slowly steal years of life. Move prevention earlier; metabolism is the base.
10 minCardiovascular Disease: A Quiet Leading Cause, and ApoB
The world's leading cause of death often arrives suddenly; track ApoB particles and trends, and start prevention decades ahead.
10 minCancer: Prevention, Screening, and Finding It Earlier
Early detection is cancer's most reachable lever: stage sets the survival gap, trials can cut deaths, and false positives are a real cost.
10 minNeurodegeneration: What Helps the Heart Often Helps the Brain
The brain uses a fifth of body oxygen and much blood flow. Small-vessel disease is in about half of dementia; exercise, pressure, and glucose lead the evidence.
10 minMetabolic Disease: From High Insulin to Fatty Liver
Insulin resistance, fatty liver, and diabetes are a pipeline; the liver warns first, and cutting liquid sugar and ultra-processed food, plus moving, is firmest.
10 minFamily History and Genetics: Ask While You Still Can
Family history is a free risk file: ask three generations what they had and at what age; genes shift odds, then screening follows.
10 minAccidental Death: A Risk That Gets Less Attention Than It Merits
Injury leads deaths at ages 5–29; weigh frequency times severity, and treat alcohol, speed, distraction, fatigue, falls, and drowning as serious risks.
9 minAging and Longevity Science: Lifespan and Healthspan
Lifespan and healthspan differ; behavior can change the pace of aging, while bio-age tests and longevity drugs are still early.
9 minMechanisms of Aging: Hallmarks, Senescence, and Autophagy
Aging is many mechanisms failing at once: cell buildup, slower autophagy, older immunity. Experts differ on whether it is a disease, and which lever.
11 minBiological Age Clocks: Epigenetic Clocks and Blood-Test Ages
Biological age is not one number: clocks track age, risk, or pace. Experts value the research, but consumer tests cannot yet predict an individual outcome.
10 minLongevity Supplements: NAD Precursors, Resveratrol, Urolithin A
The loudest, thinnest layer: NAD precursors have not shown longer life, resveratrol failed in people, and urolithin A has the firmest muscle data.
10 min07 · interventions
Medications & Interventions
Goal first, marker second, risk last
Medications and Supplements: Three Questions Before You Start
Three questions for a drug or supplement: goal, biomarker, risk versus benefit; behavior first, evidence ranked, animal amounts do not copy.
10 minSupplements: How Firm the Evidence Actually Is
Replacing a confirmed shortfall has the firmest evidence; preventing disease or aging has the weakest. Multivitamins sit in between. Behavior comes first.
10 minPrescription Drugs and Longevity: From Statins to Rapamycin
A spectrum: statins firmest, GLP-1 uses expanding, metformin mixed, human rapamycin just starting; behavior stays ahead of drugs.
11 minCold Exposure: What a Cold Plunge Actually Changes
Cold water raises norepinephrine and dopamine and can ease soreness; weight-loss evidence is thin, and a plunge right after lifting blunts muscle gains.
10 minHeat Exposure: Sauna, Whole-Body Heat, and Red Light
Frequent sauna tracks lower heart and dementia deaths in a Finnish cohort; mechanisms are real, trials are missing, mood evidence leads, exercise first.
11 minVitamin D: Evidence, Debate, and How to Read Your Lab
It acts more like a hormone than a vitamin: shortfall is common, large trials cooled cancer and heart hopes, and the debate is the target and routine use.
9 minOmega-3 Fats and What the Omega-3 Index Measures
Fatty fish first, and the omega-3 index can be measured and changed; routine use in healthy people is unproven, and more tracks with atrial fibrillation.
10 minMagnesium, Zinc, Vitamin C, and Multivitamins
Fix the plate before supplements: magnesium gaps are most common, excess zinc crowds out copper, vitamin C does not stop colds, a multivitamin is insurance.
11 minCreatine, Collagen, and Choline in Everyday Use
Creatine has the firmest evidence, collagen's gains are modest, and choline starts with food; none replaces training or a balanced diet.
12 min08 · daily-life
Daily Life & Environment
Fitting the science into an ordinary day
A Day in Practice: Routines Side by Side
A fixed wake time, bright days, and dark nights are where the views meet; schedule regularity tracks with long-term health risk.
10 minEnvironment: Light, Temperature, Noise, Air, and Microplastics
Air pollution tracks death risk firmly and temperature kills by the millions; microplastics show up in artery plaque, and cutting exposure can be low-cost.
11 minTechnology, Screens, and Social Media in Daily Life
Sleep is the most consistent harm channel for screens; over three hours of teen social media tracks with higher internalizing risk, but effect size is debated.
10 min