Planetary Health Diet Cuts Heart Disease Risk by 13% in 29-Year Study
Following the EAT-Lancet sustainable diet reduced cardiovascular disease, stroke, and death risk in 13,444 Americans over nearly 3 decades.
Summary
A 29-year study of 13,444 Americans found that following the EAT-Lancet planetary health diet—emphasizing plant foods while limiting meat and dairy—reduced cardiovascular disease risk by 13%. The diet, designed for both human and environmental health, also cut stroke risk by 16%, heart failure by 9%, and overall death risk by 10%. Participants with the highest adherence scores had significantly better outcomes across all measures, suggesting that sustainable eating patterns can simultaneously benefit personal health and the planet.
Detailed Summary
The EAT-Lancet Commission's planetary health diet, designed to feed 10 billion people sustainably while reducing environmental impact, has now been shown to significantly reduce cardiovascular disease and death risk in a major long-term American study. Researchers from Johns Hopkins analyzed 29 years of data from 13,444 middle-aged adults in the ARIC study, finding that those most closely following this plant-forward eating pattern had substantially better health outcomes.
The study used the Planetary Health Diet Index (PHDI) to measure adherence to the EAT-Lancet recommendations, which emphasize whole grains, vegetables, fruits, nuts, and legumes while limiting red meat, dairy, and added sugars. Participants' diets were scored from 0-135, with higher scores indicating greater adherence. The average score was 76, with a range of 30-113.
Over nearly three decades of follow-up, researchers documented 5,074 cardiovascular events, 2,512 cardiovascular deaths, and 8,436 total deaths. Those in the highest versus lowest quintile of PHDI scores showed remarkable risk reductions: 13% lower total cardiovascular disease risk, 16% lower stroke risk, and 9% lower heart failure risk (all p≤0.02). For every 20-point increase in PHDI score, participants experienced 13% lower coronary heart disease risk, 13% lower cardiovascular death risk, and 10% lower all-cause mortality risk.
These findings are particularly significant because they come from a diverse American population including Black and White participants across different education and income levels—not just highly educated health professionals as in previous studies. The results suggest that dietary patterns designed for planetary sustainability can simultaneously promote human longevity and cardiovascular health, offering a potential solution to both the global health and climate crises.
Key Findings
- Highest vs lowest PHDI adherence reduced total cardiovascular disease risk by 13% (p-trend <0.001)
- Every 20-point PHDI increase lowered stroke risk by 16% (p≤0.02)
- Heart failure risk decreased by 9% per 20-point PHDI increase (p≤0.02)
- Cardiovascular death risk reduced by 13% per 20-point PHDI increase (p≤0.003)
- All-cause mortality decreased by 10% per 20-point PHDI increase (p≤0.003)
- Study tracked 13,444 participants over 29 years, documenting 5,074 CVD events and 8,436 total deaths
- Average PHDI score was 76 out of 135 possible points, with range of 30-113
Methodology
Prospective cohort study following 13,444 middle-aged Americans (45-64 years) from the ARIC study for median 29 years (1987-2022). Dietary intake assessed using 66-item food frequency questionnaires at visits 1 and 3. PHDI scores calculated from 14 food components (0-135 scale). Cox proportional hazards regression used to calculate risk associations, with expert-adjudicated cardiovascular outcomes.
Study Limitations
The study was observational, so causation cannot be definitively established. The food frequency questionnaire did not capture soy foods, requiring exclusion of this PHDI component. Dietary assessment relied on self-reporting, which may introduce measurement error. The study population was predominantly Black and White Americans, potentially limiting generalizability to other ethnic groups.
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