Healthy eating was linked to slower biological aging, with no single best pattern

News summary

Medical Xpress reported that researchers compared 10 diet-quality scores, including Mediterranean, DASH (Dietary Approaches to Stop Hypertension), MIND (a pattern emphasizing foods linked to brain health), Nordic, and plant-based patterns. Better overall diet quality was generally associated with more favorable markers of epigenetic aging—chemical changes on DNA that can be used to estimate aspects of biological aging. People who ranked highly on one diet score did not necessarily rank highly on the others, suggesting that several different healthy eating patterns may be compatible with healthier biological aging rather than one universally best diet.

In the Rhineland Study, a population study in Germany, stronger adherence to healthier dietary patterns was associated with lower epigenetic age acceleration, although the magnitude varied across diet scores. Key findings were then examined and confirmed in EPIC-Potsdam, an independent population study in the Potsdam region of Germany. The researchers also found substantial overlap in biological pathways linked to DNA methylation—chemical marks that can regulate gene activity without changing the DNA sequence—across dietary patterns.

The study does not prove that any specific diet slows aging. A more cautious interpretation is that several high-quality dietary patterns may point in a favorable direction on biological aging markers, so choosing a healthy pattern that fits culture, budget and long-term adherence may be more practical than searching for one universally best diet.

This was an observational analysis and cannot establish causation. The primary Rhineland analysis used cross-sectional baseline data, dietary intake was assessed with a food-frequency questionnaire, and measurement error or residual confounding may remain. The cohorts were also predominantly German, so broader generalizability requires further study.