Large U.S. datasets show diets rich in whole plant foods are associated with reduced epigenetic aging, though researchers caution findings are observational.
By yourNEWS Media Newsroom
A large-scale analysis of U.S. health data has found that individuals who consume more plant-based foods tend to exhibit slower biological aging, as measured by DNA-based markers, according to research published in March 2026.
The study, led by Hyunju Kim, analyzed nearly 5,000 participants drawn from two major datasets: the Atherosclerosis Risk in Communities study and the National Health and Nutrition Examination Survey. Researchers examined how dietary patterns correspond with epigenetic aging, a process measured through chemical modifications to DNA known as methylation.
Participants with higher scores on healthy plant-based diet indices were found to have lower biological ages relative to their chronological ages. The association was consistent across multiple measures of epigenetic aging, including GrimAge2, PhenoAge and HannumAge, and was observed across diverse racial and ethnic groups represented in both datasets.
The analysis did not identify a similar association for diets categorized as unhealthy plant-based patterns, which include higher consumption of refined grains, sugary beverages and processed foods. Researchers emphasized that not all plant-based diets yield the same outcomes, with distinctions between whole-food diets and processed alternatives playing a key role.
To evaluate dietary habits, the study used four scoring systems that assessed overall plant-based intake, healthy plant-based foods, unhealthy plant-based foods and a provegetarian dietary pattern. The findings indicated that increases in healthy plant-based diet scores were associated with reductions in biological aging ranging from approximately 0.16 to 0.34 years across different metrics.
Whole grains emerged as a particularly consistent factor associated with slower aging in both datasets, while higher intake of animal fats was linked to faster biological aging in one of the cohorts.
Researchers also explored whether epigenetic aging could help explain previously observed links between plant-based diets and longevity. One measure, GrimAge2, accounted for between one-third and nearly half of the relationship between plant-based diet adherence and reduced risk of death from any cause.
The study’s authors noted that plant-based diets are typically rich in fiber, antioxidants and other compounds that may reduce inflammation and cellular damage—factors associated with aging processes. Additional discussion referenced findings from GreenMedInfo suggesting that plant-derived compounds may influence gene regulation, though the study itself did not directly test those mechanisms.
The researchers emphasized several limitations, including the observational nature of the study, which prevents establishing cause-and-effect relationships. Dietary data was self-reported, and in some cases collected at a single point in time, limiting the ability to assess long-term dietary patterns.
Kim stated that further research, including longitudinal and controlled studies, is needed to determine whether sustained adherence to healthy plant-based diets can directly influence biological aging and related health outcomes.
The findings contribute to a growing body of research examining how nutrition affects aging at the molecular level, with potential implications for long-term health and disease prevention.
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