How to slow aging naturally

Aging is not one process but many linked ones, running at the same time from your molecules up to your organs. A widely cited review sorted them into twelve "hallmarks of aging", each a process that pushes the body downhill and feeds the others.^[1] Here they are in plain language:

• Genomic instability: DNA damage that piles up over the years
• Telomere attrition: telomeres (the protective caps on your chromosomes) wear down and get shorter
• Epigenetic alterations: the chemical tags that sit on your DNA and switch genes on and off start to drift
• Loss of proteostasis: broken proteins build up inside your cells instead of getting cleared out
• Disabled macroautophagy: the cell's self-cleaning, which recycles worn parts, slows down
• Deregulated nutrient sensing: the cell stops reading food signals the way it should
• Mitochondrial dysfunction: mitochondria, the power plants inside your cells, put out less energy
• Cellular senescence: zombie cells (worn-out cells that won't die and keep spewing inflammation) pile up
• Stem cell exhaustion: the body runs low on stem cells, the reserve cells that repair worn tissue
• Altered intercellular communication: the signals cells send each other get muddled
• Chronic inflammation: a low level of inflammation that never fully switches off, nicknamed "inflammaging"
• Dysbiosis: the mix of bacteria in your gut shifts as you age

The list reads like a repair bill, but several of these processes respond to how you live, mostly in lab and animal studies.^[1] In people, the habits in this guide are linked to longer life,^[10] though nobody has shown that they slow all twelve hallmarks. Movement is one of the best-studied of those habits, and the American Heart Association bundles it with seven others into a short checklist.

Life's Essential 8 is the American Heart Association's score for eight health habits and measures, and higher scores are linked to a younger biological age.^[9][15] Biological age here means phenotypic age, an estimate of how old your body is that is read off routine blood markers. In two large US analyses, people with high scores were about 6 years younger by that measure than people with low scores.^[9][15]

Both analyses drew on NHANES, a long-running US national health survey. One of them is only a conference abstract, which has not been through full peer review.^[15] Since both are observational (researchers watch people instead of testing a change), they show a pattern across the population, not a result you are promised.

The eight factors come with the targets the AHA uses for scoring.^[20]:

1. Eat better: more fruit, vegetables, whole grains, nuts, seeds and lean protein, less ultra-processed food, added sugar and salt^[20]
2. Be more active: aim for at least 150 minutes of moderate activity or 75 minutes of vigorous activity a week, or a mix of both.^[20][34] The WHO also advises muscle-strengthening work on 2 or more days a week, which the AHA score does not count.^[34]
3. Quit tobacco: the score counts cigarettes, vapes and secondhand smoke, and quitting improves it at any age.^[20]
4. Sleep well: adults score best with 7 to 9 hours a night.^[20]
5. Manage weight: a BMI (body mass index, your weight relative to your height) of 18.5 to 24.9.^[10][20]
6. Control cholesterol: the score uses non-HDL cholesterol, which is your total cholesterol minus the HDL ("good") kind. Under 130 mg/dL (milligrams per decilitre of blood) counts as ideal.^[20] Diet comes first, and medication if your doctor advises it.^[20]
7. Manage blood sugar: the score gives full points to people without diabetes or prediabetes and fewer as blood sugar rises.^[20]
8. Manage blood pressure: under 120/80 mmHg counts as optimal in the score.^[20] If you are treated for high blood pressure, your doctor sets your personal target.

Those targets are scoring categories, not personal treatment goals. The overall score is simply the average of all eight, so your weakest factor counts as much as your best one.^[20]

Regular exercise, and the fitness it builds, is one of the best-studied ways to age more slowly. Most of that evidence comes from watching people rather than from trials. One study followed 122,007 patients who had been sent for a treadmill test.^[5] The fittest 2 to 3% of them died about 80% less often over the follow-up than the least fit quarter.^[5] Being unfit carried a death risk on par with smoking or diabetes, and the researchers saw no upper limit: the fitter the group, the lower its risk.^[5]

That treadmill study measured fitness, not training, so it leaves open how much movement it takes to get there. A large Taiwanese cohort (a group of people followed over time) found that the biggest jump is from nothing to something.^[14] About 15 minutes of moderate activity a day went with 14% lower mortality and about 3 more years of life expectancy than doing nothing.^[14] Each extra 15 minutes a day lowered the risk by another 4%, and the benefit held across all age groups.^[14]

A snapshot of US adults points the same way inside your cells. Very active adults had longer telomeres, the protective caps on chromosomes that shorten with age, than inactive adults.^[2] The gap matched roughly 9 years of cellular aging, but the study compared different people at one moment instead of following anyone over time. So it shows a link, not proof that training lengthened anyone's telomeres.

To build that kind of fitness, a good week mixes four kinds of training:

• Cardio (walking, running, cycling, swimming): the backbone of the WHO advice of 150 to 300 minutes of moderate activity a week, or 75 to 150 minutes of vigorous activity.^[34]
• Intervals (HIIT): short hard bursts with easy recovery in between. In one trial, older adults who did interval training raised the energy output of their mitochondria, the little power plants inside each cell.^[3]
• Strength training: lifting weights or working against resistance to keep your muscle as you get older; the WHO recommends it on 2 or more days a week for adults, including older adults.^[34]
• Zone 2: easy cardio at a pace where you can still chat, which builds your aerobic base. The Zone 2 and VO2max guide shows how to find your pace.

For everyday walking, a step count gives you a simple target. An analysis that pooled 15 studies found that the benefit for mortality levelled off at these daily counts.^[7]:

• Adults 60 and up: roughly 6,000 to 8,000 steps a day
• Under 60: roughly 8,000 to 10,000 steps a day

So the famous 10,000 is about the ceiling for younger adults, not an entry fee.

Start safely, then use the sample week

The sample week below is for people who already move regularly. If you are starting from little or nothing, begin with walking and easy strength work, and add intervals after a few weeks. Hard effort raises the short-term risk of a heart event in unfit people with hidden heart disease^[25] So if you have heart disease, chest pain or several risk factors, get checked before you start. Stop and get assessed if you feel chest pain, faintness or unusual breathlessness.

Once you move regularly, a week could look like this, Monday to Sunday:

• Mon: 45 min Zone 2 (walk, easy bike, or swim at chatting pace)
• Tue: 40 min strength (squat, hip hinge like a deadlift, push, pull, carry)
• Wed: rest or a 20 min walk
• Thu (optional, once you are fit): about 40 min Norwegian 4x4: 10 min warm-up, 4 x 4 min hard (85 to 95% of max heart rate) with 3 min easy in between, 5 min cool-down.^[28]
• Fri: 40 min strength
• Sat: 60 to 90 min outdoors (a hike or bike ride, a Wanderung or Radtour)
• Sun: rest, plus an optional sauna (for example 2 to 3 rounds with cooling breaks)

Sauna as an extra

That Sunday sauna has a well-known Finnish study behind it, which the sauna guide covers in depth. Of the 2,315 middle-aged men it followed, those who went 4 to 7 times a week were about 40% less likely to die from any cause than once-a-week bathers^[6] Longer sessions went with a lower risk of cardiac death, though not of death from any cause.^[6] The saunas ran at about 77 to 80 °C on average.^[6] Because the men reported their own habits, this is a pattern rather than a tested dose, and it says nothing direct about women. A single weekly visit, like the sample week's, sits at the study's comparison level, well below the 4 to 7 linked with the lower risk.^[6]

Sauna is not for everyone, though. Take cooling breaks, drink water, have no alcohol before or in the sauna, and leave if you feel dizzy. If you have unstable angina, a recent heart attack or severe aortic stenosis (a narrowed main heart valve), do not use a sauna without your cardiologist's OK.^[30]

Sessions cost money as well as time, and prices vary by town and ticket length. In Munich, a 4-hour ticket at the city-run SWM saunas costs €23, or €17.50 in the evening (as of October 2026).^[36] The sauna stays an extra, so the core of the week is still 150 to 300 minutes of moderate movement and two or more strength days.^[34] If you are new to training, build up to that slowly.

A Mediterranean way of eating, built on vegetables, olive oil, fish, legumes and whole grains, is linked to a longer life in large studies. In one study of about 25,000 US women, the closest followers of the pattern had about a fifth lower risk of dying than the least faithful.^[8] After adjusting for other lifestyle factors, that gap shrank to about a tenth.^[8] An older analysis that pooled many cohorts points the same way: the closer people kept to the pattern, the lower their risk of death.^[4]

Both studies are observational, so they show that the pattern goes with a longer life, not that the food caused it. Wine often appears in the classic Mediterranean picture, but Germany's nutrition society (DGE) now advises skipping alcohol altogether.^[16] The rest of the pattern turns into a few rules of thumb:

• Mostly plants: let vegetables, fruit, legumes and whole grains fill most of your plate.
• Fiber first: legumes, whole grains and vegetables carry most of it.
• Keep healthy fats in: olive oil for monounsaturated fat, walnuts and flaxseed for plant omega-3, fatty fish for the omega-3s EPA and DHA.
• Go easy on ultra-processed food and added sugar: sweets, soft drinks, chips and ready meals high in sugar, salt and fat. Yogurt, Quark, wholegrain bread and canned fish are processed too, and they are fine.
• Enough protein, from varied sources: the DGE reference is 0.8 g per kg of body weight a day for adults under 65 and an estimated 1.0 g from 65 on.^[35] Legumes, fish, dairy and eggs all count. If you have kidney disease, ask your doctor.

Eating less and fasting

Eating less has been tested in people against a marker of aging, with a catch. In the 2-year CALERIE trial, healthy adults aged 21 to 50 without obesity were asked to eat 25% less, and they managed about 12% less on average.^[11] Aging clocks estimate biological age from chemical tags on your DNA. The dieters aged slightly slower on one of them, a pace-of-aging measure, but not on the other clocks tested.^[11]

That small gain came at a price, because the same trial cost the participants some lean mass and a little bone density at the spine and hip.^[23] So this is not advice to eat much less on your own. Skip it if you are underweight, pregnant or breastfeeding, older and losing muscle, or have had an eating disorder, and get medical advice before any large cut.

A gentler version needs no counting: the Okinawan saying hara hachi bu means stopping when you are about 80% full. Squeezing your meals into a shorter eating window is another way to eat a little less, and the intermittent fasting guide walks through it in detail. For weight loss in adults with overweight or obesity, though, a 2026 Cochrane review found little or no difference from standard diet advice, based on low-certainty evidence.^[24] If you take insulin or other diabetes drugs, talk to your doctor before fasting.

Supplements

Supplements are where you fine-tune the plate above, and two randomized trials in older adults, where chance decided who got the pill, have already found small effects on aging clocks. In a later analysis of the Swiss-led DO-HEALTH trial, 1 g of omega-3 a day slowed three of four clocks by a few months over 3 years.^[12] A similarly small shift appeared in the US COSMOS trial, where a daily multivitamin slowed two clocks slightly over 2 years.^[21] Compounds like NMN, resveratrol or spermidine show promising signals in animal studies, while the human data are still thin. Clocks are lab markers, so the open question is whether these small shifts turn into fewer illnesses or a longer life.

To use omega-3 capsules well, know this downside first. In large heart trials they raised the risk of atrial fibrillation, a heart-rhythm disorder, slightly at 1 g a day or less and more at higher doses.^[22] If you have heart-rhythm problems or take blood thinners, talk to your doctor first. Fatty fish once or twice a week is the simplest source of EPA and DHA, and a capsule is an option when fish rarely makes it onto your plate.

A shopping list for Germany, Austria and Switzerland

The Mediterranean basics are cheap in any supermarket in the DACH countries (Rewe, Edeka, Billa, Migros), aisle by aisle:

• Legumes and grains: rote Linsen (red lentils), Kichererbsen (chickpeas), Haferflocken (oats), Vollkornbrot (wholegrain bread)
• Greens: Grünkohl (kale, Oct to Feb), Feldsalat (lamb's lettuce), Mangold (chard)
• Fish: Hering (herring), Makrele (mackerel), Sardinen (sardines)
• Fats and dairy: Walnüsse (walnuts), kaltgepresstes Olivenöl (cold-pressed olive oil), Quark/Skyr/Joghurt, Eier (eggs)

Aim for 7 to 9 hours of sleep on a regular schedule, the range the American Heart Association scores best.^[20] Both very short and very long sleep are linked to higher mortality, and chronic stress is linked to faster cellular aging.^[17][18] Sleep and stress get far less attention than diet and exercise, even though sleep is one of the eight factors in the AHA score.^[20]

Sleep

A pooled analysis of 16 studies linked both short and long sleep with a higher risk of dying.^[17] Compared with people in the middle, the risk was somewhat higher for short sleepers and higher still for long sleepers.^[17] Where short ended and long began varied from study to study. These are observational links, and long sleep can also be a sign of an illness that is already there, so a long night is not automatically the problem.

What helps in practice is mostly regularity and a calm bedroom:

• Aim for 7 to 9 hours a night.^[20]
• Go to bed and wake up at roughly the same time
• Keep the room dark, cool and quiet
• Put screens away and skip caffeine in the hours before bed
• Care about quality as well as hours; the deep sleep guide covers how to get more of the restorative stages

Stress

Chronic stress is linked to faster aging at the level of your cells. In a small study of healthy women, those under the most stress had shorter telomeres than women under little stress, by roughly a decade's worth of aging^[18] That shows a link, not cause and effect.

Whether stress relief slows aging is not shown either: in an 18-month trial in adults over 65, meditation training did not change telomere length.^[29] Stress relief may still be worth it for how you sleep and feel. Reasonable places to start are meditation and mindfulness, deep breathing, time outside, moving your body, staying close to your people and real downtime. The aim is better recovery rather than zero stress, which nobody manages anyway, and most of these cost nothing but a little time.

The levers with the strongest evidence are the everyday ones: moving, eating mostly plants, sleeping enough, not smoking and drinking little or no alcohol.^{[5][8][10][16]} Supplements, aging clocks and biohacks build on top of them: their effects are smaller and earlier, and some are still unproven, which makes them a strong second step rather than the first. The table puts the best number for each lever side by side, and the tiers below turn those numbers into an order of work.

Four of the five habits behind those extra years were never smoking, a normal weight, a high-quality diet and at least 30 minutes a day of moderate to vigorous activity^[10] The fifth was moderate drinking as the study defined it,^[10] but this guide recommends less or none, so Tier 1 asks for the stricter version.

Tier 1: strong evidence, start here

• Regular movement, cardio plus strength.^[5][14][34]
• Plant-rich, whole-food eating^[4][8]
• Enough sleep, 7 to 9 hours^[17][20]
• No smoking^[10][20]
• No alcohol, or as little as possible^[16]
• A healthy weight^[10][20]

Tier 2: promising, mostly observational

• Stress recovery: chronic stress is linked to markers of cellular aging, but a benefit of stress relief for aging itself is not shown^[18][29]
• Regular sauna: linked to lower cardiovascular and overall mortality in Finnish men, in an observational study.^[6]

Tier 3: early or unproven, some with risks

• Time-restricted eating or intermittent fasting: mainly another way to eat less. For weight loss in adults with overweight or obesity, a 2026 Cochrane review found little or no difference from ordinary diet advice (low-certainty evidence),^[24] and no trial shows it slows aging.
• Cold exposure: trials show short-term effects on stress and wellbeing, but no data on aging or lifespan.^[26] Cold-water immersion can trigger cold shock and has led to drowning and cardiac arrest,^[27] so never go in alone, enter slowly, and skip it if you have heart disease or high blood pressure.
• Omega-3 (1 g a day) or a daily multivitamin: the supplements with first trial results on aging clocks, small effects in one trial each.^[12][21] Whether that means fewer diseases is still open, and omega-3 capsules slightly raise the risk of atrial fibrillation.^[22]
• Vitamin D: slowed telomere shortening slightly in the large VITAL trial, which is a marker rather than an outcome.^[38] On its own, it did not slow aging clocks in DO-HEALTH.^[12]
• NMN, resveratrol, spermidine: a promising research field, so far with mostly animal data and little human evidence. NMN also lacked EU approval as a food supplement as of January 2026,^[33] and a May 2026 safety opinion on one product from EFSA, the EU's food safety authority, may change that.^[37]
• Testing and tracking your biological age: different clocks often disagree, even within one trial.^[11][12]

A reasonable first step is to pick your weakest Tier 1 habit and turn it into a routine before you add the next one.