National Harbor, Md. (July 25, 2026) — 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.
The findings showed that women whose diet most closely followed the Planetary Health Diet had about a 28% lower risk of cardiovascular disease compared with women in the group scoring the lowest for adherence. However, even moderate adherence to the diet was linked with lower risk.
The Planetary Health Diet emphasizes foods such as fruits, vegetables, whole grains, legumes, nuts and unsaturated fats while limiting foods such as red and processed meats, added sugars, refined grains and saturated fats.
“Our results suggest that people may not need to follow a perfect or very restrictive diet to see potential heart-health benefits,” said Donya Shahamati, a doctoral student in public health at the University of California, Irvine. “This is especially important for postmenopausal women, because cardiovascular risk increases with age and tends to rise after menopause.”
Shahamati will present the findings at NUTRITION 2026 , the flagship annual meeting of the American Society for Nutrition, held July 25–28 in National Harbor, Maryland, just outside Washington, D.C.
“Moving toward a more plant-forward, higher-quality diet can be accomplished through small, realistic changes,” said Shahamati. “These changes might include filling half the plate with vegetables more often; using avocado or olive oil in place of butter; choosing oatmeal or whole-grain cereal for breakfast; or trying a meatless meal once per week.”
For the new research, the investigators followed 66,892 participants in the Women’s Health Initiative (WHI), a long-term national health study funded by the National Heart, Lung and Blood Institute at the National Institutes of Health. All the women included in the analysis were free of cardiovascular disease at the start of the study (1994-1998) and had complete information on diet and other important health and lifestyle factors.
Using information collected through a food frequency questionnaire administered at the beginning of the study, the researchers calculated a Planetary Health Diet Index score for each study participant, with higher scores indicating a diet was more aligned with the Planetary Health Diet. The researchers then divided the women into five groups based on how closely their diets aligned with the Planetary Health Diet.
The women, who were around 63 years old at the start of the study, were followed for about 20 years to see who developed cardiovascular disease. When analyzing the data, the researchers adjusted for several factors that could affect cardiovascular risk, including age, race and ethnicity, education, income, smoking, alcohol intake, physical activity, body mass index and total calorie intake.
“We did not only look at overall cardiovascular disease,” said Shahamati. “We also looked separately at coronary heart disease, stroke and heart failure. This helped us see whether the pattern was similar across different types of cardiovascular outcomes.”
Overall, the results showed that women in the group whose diets were more closely aligned with the Planetary Health Diet had the lowest risk of cardiovascular disease. These women also showed a decreased risk of heart disease, heart failure and stroke risk compared to the women in the lowest-adherence group.
However, even moderate adherence to the diet was associated with a decrease in risk, with each 10-point increase in Planetary Health Diet Index score linked to further risk reduction.
The researchers caution that an observational study like this cannot show that diet directly caused the lower risk in women.
The research team is now exploring other aspects of diet and health in older adult populations. For example, they are examining how diet quality changes over time in this population, information that could help support healthy aging and prevent chronic diseases.
Shahamati will present this research at 11:30 a.m. – 12:30 p.m. EDT on Saturday , July 25, during the Climate, Food Systems, Diet, Nutrition and Health Poster Session in the Gaylord National Resort & Convention Center ( abstract ; presentation details ).
Please note that abstracts presented at NUTRITION 2026 were evaluated and selected by a committee of experts but have not generally undergone the same peer review process required for publication in a scientific journal. As such, the findings presented should be considered preliminary until a peer-reviewed publication is available.
About NUTRITION 2026
NUTRITION 2026 is the flagship meeting of the American Society for Nutrition and the premier educational event for nutritional professionals around the globe. NUTRITION brings together lab scientists, practicing clinicians, population health researchers and community intervention investigators to identify solutions to today’s greatest nutrition challenges. The meeting also attracts rising leaders in the field, including undergraduate, graduate and medical students. NUTRITION 2026 will be held July 25–28 in National Harbor, Maryland, just outside Washington, D.C. https://nutrition.org/meeting/ #Nutrition2026
About the American Society for Nutrition (ASN)
ASN is the preeminent professional organization for nutrition research scientists and clinicians around the world. Founded in 1928, the society brings together the top nutrition researchers, medical practitioners, policy makers and industry leaders to advance knowledge and application of nutrition. ASN publishes four peer-reviewed journals and provides education and professional development opportunities to advance nutrition research, practice, and education. Since 2018, the American Society for Nutrition has presented NUTRITION, the leading global annual meeting for nutrition professionals. http://www.nutrition.org
Find more news briefs from NUTRITION 2026 at: https://www.eurekalert.org/newsroom/nutrition2026 .
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