A 20-year study of more than 65,000 postmenopausal women found that higher adherence to the Planetary Health Diet was associated with a lower risk of overall cardiovascular disease, coronary heart disease, stroke, and heart failure, according to findings from the Women’s Health Initiative.
Cardiovascular Risk Reduction Among Postmenopausal Women
Researchers following 66,892 participants in the long-term national health study discovered that women whose diets most closely followed the Planetary Health Diet experienced about a 28% lower risk of cardiovascular disease compared to those in the lowest-adherence group. Donya Shahamati, a doctoral student in public health at the University of California, Irvine, noted that the data also revealed benefits from moderate compliance.
Participants in the study were approximately 63 years old at the start of the research period between 1994 and 1998. Every individual included in the analysis was free of cardiovascular disease initially and provided complete dietary and lifestyle data. The study was funded by the National Heart, Lung, and Blood Institute at the National Institutes of Health.
Plant-Forward Diets and Heart Health Outcomes
The Planetary Health Diet prioritizes fruits, vegetables, whole grains, legumes, nuts, and unsaturated fats while restricting red and processed meats, added sugars, refined grains, and saturated fats. Shahamati will present the complete findings at NUTRITION 2026, the flagship annual meeting of the American Society for Nutrition held in National Harbor, Maryland.
Pro Tip: Simple dietary adjustments can improve heart health over time. Shahamati suggests filling half the plate with vegetables more often, substituting butter with olive or avocado oil, opting for whole-grain cereal for breakfast, or incorporating a meatless meal once a week.
Evaluating Long-Term Dietary Patterns
To evaluate adherence, investigators calculated a Planetary Health Diet Index score using information from a baseline food frequency questionnaire. Participants were separated into five distinct groups based on their scores. Researchers adjusted for confounding variables including age, ethnicity, education, income, smoking status, alcohol consumption, physical activity, body mass index, and total calorie intake.
The analysis tracked specific conditions separately rather than solely looking at broad outcomes. According to the research team, tracking coronary heart disease, stroke, and heart failure independently confirmed that the protective dietary pattern remained consistent across different types of cardiovascular events. Furthermore, every 10-point increase in the Planetary Health Diet Index score correlated with additional risk reduction.
Frequently Asked Questions
What foods are emphasized in the Planetary Health Diet?
The diet highlights plant-based foods including vegetables, fruits, whole grains, legumes, nuts, and unsaturated fats.
What foods should be limited?
Adherents should limit red meat, processed meat, added sugars, refined grains, and saturated fats.
Do people need to follow a strict diet to see heart-health benefits?
No, data indicates that even moderate adherence is linked to lower cardiovascular risks, meaning perfection is not required to see positive health outcomes.
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