Longevity & Aging · Supplements
olive oil decreases all-cause mortality
In plain terms: Does olive oil help you live longer?
Part of: • Olive oil
Higher olive oil intake is consistently linked to lower risk of dying over time - roughly 10-17% lower - and swapping butter or margarine for olive oil looks beneficial. It's mostly observational, and the one randomized trial showed a clear heart-death benefit but didn't quite reach significance for overall mortality. Encouraging and low-risk.
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: All trials, pooled (Meta-analysis)
How the studies fall
What the evidence shows
Higher olive oil intake is consistently associated with **living longer**: several dose-response meta-analyses put all-cause mortality roughly 10–17% lower at higher intakes (about 8% lower per 10 g/day), backed by large cohorts (the Nurses'/Health Professionals studies, EPIC-Spain, Moli-sani) that also show benefit from swapping butter or margarine for olive oil. The honest caveat is that this is
The evidence (12)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Ke L et al. 2024 · Eur J Clin Nutr | meta-analysis | supports | high | Dose-response meta 30 studies (2.7M): all-cause mortality RR 0.85; 8% lower per 10 g/d. |
| Del Saz-Lara A et al. 2024 · Adv Nutr | meta-analysis | supports | high | SR+meta 7 studies: all-cause mortality HR 0.85; CVD and cancer mortality also reduced. |
| Zhang Y et al. 2025 · JAMA Intern Med | observational | supports | high | NHS/HPFS (221k): olive oil per 5 g/d HR 0.92 total mortality; butter-to-oil swap lowered mortality 17%. |
| Tessier AJ et al. 2024 · JAMA Netw Open | observational | mixed | moderate | NHS+HPFS: >=7 g/d olive oil 28% lower dementia-related mortality (endpoint-specific). |
| Buckland G et al. 2012 · Br J Nutr | observational | supports | high | EPIC-Spain (40k): highest olive-oil quartile 26% lower overall mortality. |
| Ruggiero E et al. 2024 · Eur J Clin Nutr | observational | supports | high | Moli-sani (22k): >3 tbsp/d olive oil HR 0.80 all-cause mortality, independent of diet quality. |
| Guasch-Ferre M et al. 2022 · J Am Coll Cardiol | observational | supports | high | NHS+HPFS (92k): highest olive-oil intake HR 0.81 for all-cause mortality. |
| Martinez-Gonzalez MA et al. 2022 · Nutrients | meta-analysis | supports | high | Meta 36 studies (733k): all-cause mortality RR 0.89 per 25 g/d. |
| Guasch-Ferre M et al. 2014 · BMC Med | RCT | mixed | moderate | PREDIMED: CVD mortality reduced 48% (HR 0.52) but NO significant all-cause mortality association. |
| Zhang Y et al. 2021 · BMC Med | observational | supports | high | NIH-AARP (521k): olive oil HR 0.96/tbsp cardiometabolic mortality; substituting for butter lowered mortality. |
| Xia M et al. 2022 · Front Nutr | meta-analysis | supports | high | Meta 13 cohorts: all-cause mortality RR 0.83; plateaus ~20 g/day. |
| Buckland G et al. 2011 · Am J Epidemiol | observational | supports | moderate | EPIC-Spain (rMED): high score HR 0.79 all-cause mortality; olive oil the top contributor (whole-Med). |
Disagree, or know a study we missed?
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Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.