The things that best predict a long life aren't pills. They're how fit you are, how strong you are, and how well your metabolism handles food. All three are trainable at any age, and they beat every longevity supplement on the market by a wide margin.
The short list
Ranked by how much each one moves
Raise your VO2maxThe least fit quarter died at five times the rate of the fittest, a bigger gap than smoking.why ↓
Build and keep muscleGrip strength predicted death better than blood pressure in 140,000 people.why ↓
Don't smoke, and keep alcohol lowStill the biggest single things you can stop doing.why ↓
Fix insulin resistanceIt sits upstream of heart disease, diabetes, fatty liver, dementia and many cancers.why ↓
Walk 8,000+ steps a dayDeath rates keep falling up to about 8,000–10,000 steps, then level off.why ↓
Eat enough proteinOlder muscle needs more of it to keep building.why ↓
Sleep 7–8 hoursBoth short and very long sleep track with earlier death.why ↓
Keep people closeStrong relationships tracked with longer life about as much as quitting smoking.why ↓
Strong human evidenceSome human dataMostly animal / cell
A longevity week
2 hard interval sessions (4 × 4 minutes)
2–3 lifting sessions, full body, heavy enough to be hard
8,000+ steps a day, 10 minutes after meals
Protein at every meal, about 0.7 g per pound of goal weight a day
Sun, 7–8 hours of sleep, a sauna if you have one
Dinner with people you like
Watch out
Build up hard training over weeks, especially after 40 or with heart disease. Get checked if you have chest pain on exertion.
Metformin and high-dose antioxidants blunt the gains from exercise
Don't chase a "biological age" score. Train the real measures.
How it fits together
Think of the body as an engine, a chassis and the terrain they run on. The engine is your heart, lungs and mitochondria, and VO2max measures it. The chassis is your muscle, strength and bone, which keep you upright and independent and soak up blood sugar. The terrain is your metabolic state: insulin sensitivity, inflammation and what your membranes are made of. Each one independently predicts how long you'll live, and they're trained by different things.
Sleep, sun and people sit under all three
↓↓↓
1 · The engine
Fitness (VO2max)
How much oxygen you can use at full effort. It falls about 10% a decade if you let it, and hard intervals raise it fastest.
More years, and better ones: able to carry groceries, climb stairs and get off the floor at 85
Each panel predicts survival on its own. Training only one leaves the other two open.
Raise your VO2max
In 122,007 Cleveland Clinic patients who had a treadmill test, death rates fell with every step up in fitness and never levelled off. The least fit quarter died at five times the rate of the fittest 2%. Being below average fit carried a risk similar to smoking, diabetes or heart disease. VO2max drops about 10% a decade from your 30s, so where you start your 70s depends on how high you build it now.
Intervals raise VO2max fastest per minute, and the 4×4 is the best-studied version. In CERT it also shrank coronary plaque. Running is a strong second: in 55,137 adults, runners lived about three years longer, and even 5–10 minutes a day counted.
How: two sessions a week of four 4-minute efforts at 85–95% of max heart rate, with 3 minutes easy between. Bike, rower, hill or incline treadmill. Easy cardio and walking on other days.
In the PURE study, grip strength measured once in 139,691 people across 17 countries predicted death over four years: each 5 kg less grip meant 16% higher mortality. It predicted death better than systolic blood pressure. Muscle is where most of a meal's glucose goes, and it's what keeps you on your feet, protects you in a fall and lets you live on your own. After 60 it goes fast unless it's loaded, and bone follows.
How: lift 2–3 times a week. Full-body compound moves (squat or leg press, hinge, push, pull, carry), heavy enough that the last couple of reps are hard. Add weight over time. Carrying heavy things counts.
Smoking still takes about ten years off life expectancy, and quitting before 40 gets most of it back. Alcohol has no safe floor for cancer, damages the liver and gut lining, and wrecks sleep. If you drink, keep it occasional, with food and early in the evening.
High insulin and poor blood-sugar control sit upstream of most of what kills people in rich countries: heart disease, type 2 diabetes, fatty liver, kidney disease, many cancers and Alzheimer's, which some researchers call type 3 diabetes. Fixing insulin sensitivity improves all of those at once. The levers are the ones on this page, plus food: cut refined flour, sugary drinks and seed oils, eat real food, and keep belly fat down.
How: follow the Metabolic Health short list. Check fasting insulin, A1c, triglycerides and HDL, and measure your waist.
Across pooled step-count studies, death rates keep falling until about 6,000–8,000 steps a day in people over 60, and 8,000–10,000 in younger adults, then level off. Walking is low-stress volume you can do every day. Ten minutes after a meal flattens the blood-sugar spike, and outdoors you also get light.
How: a 10-minute walk after each meal plus one longer walk gets most people there. Take calls on foot.
Older muscle responds less to each meal of protein, a problem called anabolic resistance, so it takes more per meal to switch on muscle building. Most older adults eat less protein than they need, often skimping at breakfast and lunch. Animal protein brings leucine, creatine, B12, zinc and iron in the same bite. Gelatin and broth add the glycine that muscle meat is short on.
How: about 0.7 g per pound of goal body weight a day (1.6 g/kg), spread over 3 meals with at least 30–40 g each. That's about 5–6 oz of meat or fish, or 4–5 eggs, per meal. Add 1 tsp of creatine (5 g) a day if you lift.
In large cohorts, both under 6 hours and over 9 hours track with earlier death. Long sleep is partly a sign of illness, not a cause. Short sleep raises blood sugar, appetite, blood pressure and evening cortisol, and weakens immunity. It also keeps the brain's overnight cleanup running short.
A meta-analysis of 148 studies with over 300,000 people found that those with strong social relationships were about 50% more likely to survive over the follow-up period. That's an effect similar to quitting smoking. It's observational, and healthier people may simply be more social, but loneliness also raises cortisol and inflammation and worsens sleep.
How: regular meals with family or friends, training partners, a team or a club. Exercise with other people stacks two levers.
Sauna. In a Finnish cohort of 2,315 men, those using a sauna 4–7 times a week had about 40% lower death rates than once-a-week users. It's observational, but heat works the heart like moderate exercise.
Sun. Swedish sun-seekers lived longer than sun-avoiders, mostly from fewer heart deaths. Don't burn. Sunlight
Creatine. Helps older adults gain more muscle and strength from lifting, with early signs of benefit for the brain. Creatine
Cold exposure. Improves insulin sensitivity and brown fat. Keep it away from right after lifting, where it blunts muscle gains. Cold Exposure
Metformin if you're not diabeticIn older adults who lifted, metformin blunted the muscle gains. It also blunts the fitness gains from aerobic training. Exercise, Part IV
High-dose antioxidant pills around trainingVitamins C and E taken around training blocked some of exercise's own benefits on insulin sensitivity. Exercise, Part IV
NMN and NRThey raise NAD in the blood. Human trials so far show little change in function, and none measure lifespan.
ResveratrolPromising in yeast and mice. Null in human trials.
Rapamycin for healthy peopleExtends lifespan in mice. There's no human lifespan data, and it suppresses the immune system.
"Biological age" testsThey disagree with each other and with themselves on repeat. VO2max, grip and waist are better clocks.
Measures worth tracking
VO2maxFrom a lab test, a watch estimate, or a 12-minute run for distance. Aim to be above average for your age, and push toward the top.
Grip strengthA cheap hand dynamometer. Track it yearly.
Sit-to-floor and backGetting down to the floor and up again without using your hands tracks with survival in older adults.
Waist-to-heightKeep your waist under half your height. It tracks belly fat better than BMI.
Fasting insulin, A1c, triglycerides/HDLThe metabolic terrain. Metabolic Health