People who follow vegetarian diets, including vegan, lacto-ovo, and pesco-vegetarian patterns, have a 12% lower risk of dying from any cause over several years compared to those who eat meat regularly, even after accounting for other healthy lifestyle habits.
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 systematic review and meta-analysis of multiple prospective cohort studies across diverse populations could determine whether the association between vegetarian diets and reduced mortality is consistent, reproducible, and generalizable beyond Adventists.
A systematic review and meta-analysis of at least 10 large prospective cohort studies (each with >10,000 participants) from different countries, using standardized dietary assessment methods and adjusting for identical confounders (smoking, BMI, physical activity, alcohol), with all-cause mortality as the primary outcome over 10+ years of follow-up.
A long-term randomized trial could determine whether assigning individuals to vegetarian versus nonvegetarian diets directly reduces mortality risk, isolating diet from other lifestyle factors.
A double-blind, placebo-controlled trial randomizing 5,000 healthy adults aged 40–65 to either a whole-food, plant-based vegetarian diet (no meat, fish, or poultry; high in legumes, whole grains, fruits, vegetables) or a standard omnivorous diet for 20 years, with primary outcome being all-cause mortality and secondary outcomes including cardiovascular and cancer mortality, with strict dietary adherence monitoring and nutritional supplementation to prevent deficiencies.
A prospective cohort study in a non-Adventist population with detailed repeated dietary assessments could confirm whether the association holds in groups without shared religious or lifestyle norms.
A prospective cohort study following 20,000 adults aged 30–70 from diverse ethnic and socioeconomic backgrounds across the U.S. and Europe, with dietary intake assessed via 24-hour recalls and food diaries every 2 years for 15 years, adjusting for smoking, physical activity, BMI, education, and income, and tracking mortality via national registries.
A case-control study could compare past dietary patterns of individuals who died prematurely versus those who lived longer to identify whether vegetarian diets were more common among survivors.
A matched case-control study comparing 1,000 individuals who died from all causes before age 75 with 1,000 living controls matched for age, sex, and region, using validated food frequency questionnaires to reconstruct dietary habits over the prior 10–20 years, with adjustment for socioeconomic status and health behaviors.
A cross-sectional study could show whether vegetarian diets are more common among people who are currently alive versus those who have died, but cannot determine if diet preceded death.
A national survey measuring current dietary patterns and mortality status in 50,000 adults aged 40–80, comparing the prevalence of vegetarian diets among living individuals versus those who died in the prior 5 years, adjusting for age and sex.