10 different healthy eating patterns all tracked with slower biological aging

Ten established diet-quality scores, among them the Mediterranean, DASH, MIND and Nordic patterns, were each associated with slower biological aging in about 7,500 German adults. The German Center for Neurodegenerative Diseases (DZNE) reported the analysis in September 2026, and its authors drew a deliberately unglamorous conclusion: no single diet came out as the winner.

The ten scores and the three aging clocks

The study, led by Monique Breteler’s group at DZNE in Bonn, did not compare people who ate one diet with people who ate another. It scored the same participants against ten different definitions of a healthy diet, then asked how closely each score tracked with biological age as read from DNA methylation, the chemical tags on DNA that shift as the body ages.

According to the Nature Communications paper, the ten scores are the Mediterranean Diet Score, DASH, MIND, the Alternate Healthy Eating Index (AHEI-2010), the Nordic Diet Score, the EAT-Lancet diet, three plant-based indices (the overall, healthful and unhealthful versions), and the Dietary Inflammatory Index. The press materials name only a handful of these, so the full list matters when the count of ten is repeated.

The clocks are statistical models, each trained on different data to turn a blood sample’s methylation pattern into an estimate of biological age or aging speed. Because they were built differently, a diet score can move one clock and leave another unchanged, which is why the per-clock results below carry more weight than a single yes-or-no verdict.

Aging was measured with three epigenetic clocks, GrimAge acceleration, PhenoAge acceleration and DunedinPACE, which estimates the pace of aging. The DZNE release says the work covered roughly 850,000 sites across the genome, about double the coverage of earlier studies of diet and epigenetic aging.

DASH and Nordic at the top, EAT-Lancet at the bottom

The statement that all ten patterns tracked with slower aging is accurate for one clock and more qualified for the others. In the Rhineland Study, every one of the ten scores reached significance against DunedinPACE after correction for multiple testing. Against GrimAge and PhenoAge, the DASH and Nordic scores were associated with slower aging on all three clocks, and the Mediterranean, MIND, AHEI-2010 and two of the plant-based indices joined them on the other two clocks.

The EAT-Lancet diet was the exception. It showed no association with GrimAge or PhenoAge acceleration. The DZNE release does not mention the exception, so the statement that all ten patterns tracked with slower aging holds for DunedinPACE rather than for every clock-by-score pairing.

The effects themselves were small. DZNE says the differences between diets are modest in absolute terms, and an abstract of the study frames the work as an association study, which cannot show that eating a given way slows aging. The link between diet quality and slower aging was strongest in smokers, even though the smokers in the cohort did not eat better than non-smokers. The researchers did not claim that a good diet offsets smoking, and the release offers no explanation for the pattern.

Rhineland and Potsdam: the two cohorts behind the numbers

The first findings came from 6,470 participants in the Rhineland Study, a population study based in Bonn, of whom 5,768 entered the genome-wide methylation analysis that looks for individual DNA sites linked to each score. The team then checked whether the associations held in an independent group of 1,034 people from EPIC-Potsdam, which is where the total of roughly 7,500 adults comes from. Replication in a second, independent cohort is the main reason the result is more than a single-sample curiosity.

Breteler said the data point away from a single correct diet, stating that there is probably no single “correct” diet and adding: “various dietary patterns are associated with slower aging, some more, some less,” a finding she called encouraging because it leaves room to match healthy eating to personal and cultural preferences, budget and taste, as News-Medical reported. Her colleague Juliana Tavares put it as a repertoire: when it comes to slowing the aging process, there is not just one healthy diet but a whole range of them, and the study treats the ten scores as members of that range rather than as rivals.

The overlap behind that message is biological as well as practical. More than 70 percent of the molecular pathways flagged across the diets were shared, spanning cell structure, signaling and metabolism, according to the DZNE summary republished by Bionity.

The open limit is what a blood-based clock means for an individual. The paper reports associations in two German cohorts, and the release itself calls the effects measurable but modest. Whether any of that translates into more years of healthy life is not something the DZNE team claims to have shown.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

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