Diets
plant-based diet decreases cardiovascular events and mortality
In plain terms: Do vegetarians have fewer heart attacks and lower death rates?
Part of: 🥗 plant-based diet
Partly — cohorts show ~8-25% lower ischemic heart disease risk, but effects on total stroke and all-cause mortality are weaker and inconsistent.
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
The evidence (12)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Aune 2019 · Adv Nutr | observational | supports | moderate | High plant-food intake inversely associated with cardiovascular disease and all-cause mortality across meta-analyses. |
| Jafari 2022 · Crit Rev Food Sci Nutr | observational | supports | moderate | Pooled 12 cohorts (508,861 people): highest plant-based-diet adherence had ~10% lower all-cause mortality (HR 0.90). |
| Capodici 2024 · PLoS One | meta-analysis | supports | moderate | Umbrella review: plant-based diets associated with reduced cardiovascular disease risk and mortality. |
| Dybvik 2023 · Eur J Nutr | meta-analysis | mixed | moderate | Meta-analysis of prospective cohorts: vegetarians had lower IHD risk (~RR 0.79) but no significant reduction in total stroke or overall CVD. |
| Liu 2024 · Clin Nutr | meta-analysis | supports | moderate | Higher EAT-Lancet plant-based diet adherence associated with lower CVD and all-cause mortality. |
| Orlich 2013 · JAMA Internal Medicine | observational | supports | high | Vegetarian dietary patterns associated with lower all-cause and cardiovascular mortality in AHS-2. |
| Appleby 2016 · Am J Clin Nutr | observational | contradicts | high | No significant difference in all-cause mortality between vegetarians and comparable nonvegetarians in UK cohorts. |
| Tong 2019 · BMJ | observational | mixed | moderate | Vegetarians had lower ischaemic heart disease but higher stroke risk over 18y follow-up in EPIC-Oxford. |
| Ginter 2008 · Bratisl Lek Listy | observational | tested-null | low | Review noting meta-analyses found no significant vegetarian-vs-health-conscious-omnivore difference in stroke or several cancer mortalities; benefit attributed to fruit/veg not meat exclusion. |
| Etesami 2025 · Food Funct | meta-analysis | mixed | moderate | Healthful plant-based index lowers all-cause and CVD mortality; unhealthful index raises it (dose-response). |
| Dinu 2017 · Crit Rev Food Sci Nutr | observational | supports | moderate | Meta-analysis of observational studies: vegetarian/vegan diets associated with lower IHD incidence/mortality and lower cancer incidence. |
| Huang 2012 · Ann Nutr Metab | meta-analysis | supports | moderate | Vegetarians had ~29% lower ischaemic heart disease mortality than nonvegetarians in pooled cohorts. |
Disagree, or know a study we missed?
We grade by evidence, not opinions. The way to weigh in is to point us to a study we haven't cited (check the evidence table above first), or to flag a problem with one we have. Every submission is reviewed; if it holds up, the grade updates and shows in Science Changes Its Mind.
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Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.