A major new study tracking nearly 67,000 postmenopausal women over two decades has found that closely following the Planetary Health Diet is associated with a 28% lower risk of cardiovascular disease. The findings, presented at NUTRITION 2026 on July 25, add compelling long-term evidence that what and how we eat shapes heart health far into the future.
What the Research Found
The study followed 66,892 postmenopausal women enrolled in the Women’s Health Initiative from 1994 through a 20-year follow-up period. Researchers at the University of California, Irvine scored each participant’s diet against the Planetary Health Diet Index — a pattern that emphasizes fruits, vegetables, whole grains, legumes, nuts, and unsaturated fats while limiting red and processed meat, added sugars, and refined grains. Women who most closely followed this pattern had a 28% lower risk of overall cardiovascular disease, with significant reductions across coronary heart disease, stroke, and heart failure outcomes. According to News-Medical, the benefits persisted even at moderate levels of adherence, suggesting meaningful gains are achievable without strict compliance.
Why This Diet Pattern Stands Out
The Planetary Health Diet was originally designed with both human health and environmental sustainability in mind, developed by the EAT-Lancet Commission. This study is among the first to test it against long-term cardiovascular outcomes in a large population. The average participant age at baseline was around 63, meaning the protective association held across an older cohort already at elevated heart risk. The research was funded by the National Heart, Lung and Blood Institute at the NIH. Investigators note the study is observational and cannot establish direct causation, and the full findings are pending peer-reviewed publication.
What It Means in Practice
The Planetary Health Diet is not a restrictive protocol — it is a flexible framework built around whole plant foods. For anyone looking to reduce cardiovascular risk, the practical takeaway is straightforward: shift more calories toward vegetables, legumes, whole grains, and nuts, and reduce reliance on processed meat and refined carbohydrates. The diet’s overlap with the Mediterranean and DASH patterns means existing evidence strongly supports its core principles. These new long-term data strengthen the case that consistent, plant-forward eating is one of the most evidence-backed moves for heart health over time.