People who eat a plant-based diet that includes fish once a month or more have a 19% lower risk of dying from any cause than those who eat meat more than once a week, especially among men.
Evidence from Studies
No evidence studies found yet.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
A meta-analysis of cohort studies comparing pesco-vegetarian diets with other vegetarian and omnivorous diets could determine whether fish inclusion consistently reduces mortality across diverse populations.
A systematic review and meta-analysis of at least 8 prospective cohort studies (each >15,000 participants) that separately report mortality outcomes for pesco-vegetarians, vegans, lacto-ovo vegetarians, and omnivores, with standardized dietary definitions and adjustment for BMI, smoking, and physical activity.
A randomized trial could isolate whether adding fish to a plant-based diet reduces mortality compared to a strict vegan diet, controlling for all other variables.
A double-blind, placebo-controlled trial randomizing 3,000 adults aged 45–70 with no cardiovascular disease to either a strict vegan diet or a vegan diet supplemented with 2–3 servings of fatty fish per week for 15 years, with primary outcome being all-cause mortality and secondary outcomes including cardiovascular events and cancer incidence.
A cohort study in a non-Adventist population could confirm whether the pesco-vegetarian mortality benefit is replicable outside a health-conscious religious group.
A prospective cohort study following 25,000 adults from general U.S. and European populations, classifying dietary patterns into pesco-vegetarian, vegan, lacto-ovo vegetarian, and omnivore groups using repeated dietary assessments over 10 years, adjusting for socioeconomic status, education, and health behaviors.
A case-control study could compare past fish consumption between individuals who died prematurely and those who lived longer to assess whether pesco-vegetarian patterns were more common among survivors.
A matched case-control study comparing 1,200 individuals who died before age 70 from any cause with 1,200 living controls, using validated food frequency questionnaires to reconstruct fish intake over the prior 20 years, adjusting for age, sex, smoking, and BMI.
A cross-sectional survey could show whether people currently following pesco-vegetarian diets are more likely to be alive than those following other diets, but cannot determine if diet caused survival.
A national survey measuring current dietary patterns and mortality status in 60,000 adults aged 40–80, comparing the proportion of pesco-vegetarians among living individuals versus those who died in the prior 5 years, adjusting for age and sex.