What are the most effective ways to extend life?
Ranked across every kind of longevity intervention rather than within one category: quitting smoking is the single most effective thing anyone can do; treating blood pressure and cholesterol to target with proven drugs comes next; then adult vaccination, physical activity, a good diet, cancer screening within guidelines, sleep and low alcohol. Supplements, peptides, biological-age testing and biohacking trends rank far below all of these because none has human mortality evidence — the longevity industry sells mostly at the bottom of this list.
Ranked across every category — habits, medicine, screening and products — rather than within one category, the most effective ways to extend life turn out to cluster tightly at the top and thin out fast. First: quitting smoking, the single largest modifiable predictor of death, comparable to nothing else on this list. Second: controlling blood pressure and LDL/ApoB to target with proven drugs, because cardiovascular disease is the leading cause of death and both interventions have decades of outcome-trial evidence. Third: routine adult vaccination — influenza, pneumococcal, shingles, COVID — each with mortality evidence in the age groups that need it. Fourth: regular physical activity and a plant-forward diet, with a clear dose-response for both. Fifth: guideline cancer screening (colorectal, breast, cervical, lung in smokers), which catches disease early enough to change outcomes. Sixth: adequate sleep and low alcohol intake. Far below all of these: the longevity supplement stack (resveratrol, NMN and most of the shelf have no human mortality evidence), peptide protocols, biological-age testing, and biohacking practices like extreme fasting or cold exposure, which have plausibility and animal data at best. The honest ranking is uncomfortable for a longevity industry built on the bottom of the list: the top of it is a prescription pad, a vaccine schedule and a pair of running shoes.
- Smoking cessation outranks every other single intervention for its effect size.
- Blood pressure and lipid control are drug-based interventions with the deepest outcome-trial evidence in medicine, and they outrank most lifestyle habits individually.
- Vaccination is an underrated longevity intervention with hard mortality evidence in older adults.
- Screening only helps within guideline ages and intervals; more screening is not more effective.
- Most of what the longevity industry sells — supplements, peptides, biological-age tests — ranks below every row above because human mortality evidence is absent.
Every category of longevity intervention, ranked head-to-head
Ranked on: the strength and size of human outcome evidence (mortality or major morbidity), regardless of category — habit, drug, vaccine, screen or supplement.
| # | Option | Verdict | Grade |
|---|---|---|---|
| 1 | Quitting smoking | The single largest effect of anything on this list | GRADE AEstablished |
| 2 | Blood pressure and LDL/ApoB control to target | Decades of outcome-trial evidence; the deepest evidence base in medicine | GRADE AEstablished |
| 3 | Routine adult vaccination | Mortality evidence in the age groups that need it | GRADE AEstablished |
| 4 | Regular physical activity | Clear dose-response with mortality | GRADE AEstablished |
| 5 | A plant-forward, Mediterranean-style diet | The diet with the strongest trial evidence for hard outcomes | GRADE AEstablished |
| 6 | Guideline cancer screening | Effective within ages and intervals; not beyond them | GRADE BPromising |
| 7 | Sleep and alcohol moderation | Consistent cohort evidence; smaller individual effect size | GRADE BPromising |
| 8 | Longevity supplements (NMN, resveratrol, most of the shelf) | No human mortality evidence | GRADE DInsufficient or unsafe |
| 9 | Peptide protocols, biological-age testing, biohacking practices | Plausibility and animal data at best | GRADE DInsufficient or unsafe |
- 01
Quitting smoking
GRADE AEstablishedThe single largest effect of anything on this listRoughly a decade of life expectancy on average for continuing smokers versus never-smokers, with meaningful years recovered even by quitting after 60. No drug, supplement or test comes close to this effect size for the people it applies to.
- 02
Blood pressure and LDL/ApoB control to target
GRADE AEstablishedDecades of outcome-trial evidence; the deepest evidence base in medicineAntihypertensives and statins (or other lipid-lowering drugs) reduce stroke, heart attack and cardiovascular death in large randomised trials, for people whose levels warrant treatment. Cardiovascular disease remains the leading cause of death worldwide, which is why controlling its two largest risk factors ranks this high.
- 03
Routine adult vaccination
GRADE AEstablishedMortality evidence in the age groups that need itInfluenza and pneumococcal vaccination reduce mortality in older adults; shingles vaccination reduces a painful and sometimes disabling condition and carries an emerging signal for reduced dementia risk. Cheap, quick, and consistently under-used relative to its evidence.
- 04
Regular physical activity
GRADE AEstablishedClear dose-response with mortality150–300 minutes of moderate activity weekly, plus resistance training, is associated with substantially lower all-cause mortality across cohorts, with benefit starting well below guideline levels.
- 05
A plant-forward, Mediterranean-style diet
GRADE AEstablishedThe diet with the strongest trial evidence for hard outcomesRandomised evidence (PREDIMED and successors) shows reduced cardiovascular events; decades of cohort data support the pattern for overall mortality. Outranks any specific 'longevity diet' marketed as novel.
- 06
Guideline cancer screening
GRADE BPromisingEffective within ages and intervals; not beyond themColorectal, breast and cervical screening at recommended ages and intervals, and low-dose CT for heavy smokers, reduce cancer mortality in trials. Extending screening beyond guidelines (younger ages, shorter intervals, whole-body scans) adds false positives and overdiagnosis rather than benefit.
- 07
Sleep and alcohol moderation
GRADE BPromisingConsistent cohort evidence; smaller individual effect sizeSeven to eight hours of sleep and low alcohol intake are each associated with lower mortality in cohorts. Real and worth doing; smaller in magnitude than the rows above.
- 08
Longevity supplements (NMN, resveratrol, most of the shelf)
GRADE DInsufficient or unsafeNo human mortality evidenceAnimal lifespan data exist for several compounds; human trials measure biomarkers, not survival, and none has shown a mortality benefit. A handful of specific supplements (vitamin D in deficiency, omega-3 in specific cardiovascular contexts, creatine for muscle) have real evidence for narrower outcomes, which is why the site grades supplements individually rather than as a category.
- 09
Peptide protocols, biological-age testing, biohacking practices
GRADE DInsufficient or unsafePlausibility and animal data at bestCompounded peptides (BPC-157, epitalon and similar), biological-age clocks used to guide treatment, and biohacking practices such as extreme fasting or cold exposure have no human mortality evidence and, for compounded peptides, real safety and sourcing concerns. The bottom of the cross-category ranking, and the part of the longevity industry with the most marketing.
Why the ranking looks like this
Evidence type behind each tier
| Tier | Evidence type | What it takes to move up |
|---|---|---|
| Smoking, BP/lipid control, vaccination | Randomised outcome trials; decades of data | Nothing — this is the top |
| Activity, diet, screening within guidelines | Randomised and strong cohort evidence | More trials, which mostly exist already |
| Sleep, alcohol moderation | Consistent cohort evidence | Randomised outcome trials, which are hard to run for lifestyle factors |
| Longevity supplements (most) | Animal data; human biomarker trials | A human mortality or major-morbidity trial |
| Peptides, biological-age testing, biohacking | Plausibility, small studies, marketing | Any human outcome trial at all |
Frequently asked questions
What are the most effective ways to extend life?
Ranked by strength of human outcome evidence across every category: quitting smoking; treating blood pressure and cholesterol/ApoB to target with proven drugs; routine adult vaccination; regular physical activity; a plant-forward diet; guideline cancer screening; and adequate sleep with low alcohol. Longevity supplements, peptide protocols, biological-age testing and biohacking trends rank well below all of these because none has human mortality evidence.
Do supplements make the list of most effective longevity interventions?
Not as a category. Most longevity supplements (NMN, resveratrol and similar) have animal lifespan data and human biomarker trials but no human mortality evidence. A handful of specific ones — vitamin D for measured deficiency, omega-3 in specific cardiovascular contexts, creatine for muscle preservation — have real evidence for narrower outcomes and are graded individually elsewhere on this site.
Is medication more effective than lifestyle for extending life?
For blood pressure and cholesterol specifically, yes — decades of randomised outcome trials support treating both to target, and cardiovascular disease is the leading cause of death. Lifestyle habits (activity, diet) also have strong evidence and work alongside medication rather than instead of it; the two are not competing categories.
Why does vaccination rank so high on a longevity list?
Because influenza and pneumococcal vaccination have direct mortality evidence in older adults, shingles vaccination prevents a serious and sometimes disabling condition with an emerging dementia-risk signal, and vaccination is cheap, quick and consistently under-used relative to how strong its evidence is compared with products that cost far more.
Does more cancer screening extend life more?
No. Screening helps within the ages and intervals guidelines recommend, where trials show reduced cancer mortality. Extending screening beyond that — younger ages, shorter intervals, whole-body imaging, unproven blood tests — adds false positives and overdiagnosis without added benefit, which is why it is graded lower than screening done to guideline.
Are peptides or biological-age tests worth trying for longevity?
On current evidence, no, as a primary strategy. Compounded peptides have no human mortality evidence and carry real safety and sourcing concerns; biological-age clocks are not validated to guide treatment decisions. Both sit at the bottom of a cross-category ranking dominated by cheaper, better-evidenced interventions like blood-pressure control and vaccination.
Keep reading
- How can I extend life through daily habits?
The habit-only version of this ranking, in more depth.
- Which science-backed supplements can safely extend life?
Where the individual supplements that do have evidence rank.
- Longevity health clinics
How the top of this ranking should be delivered in practice.
- Free stack check
Check where your current stack falls on this ranking.
More in Protocols & lifestyle
- How can I extend life through daily habits?
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