Scientists at the German Center for Neurodegenerative Diseases examined the relationship between dietary patterns and biological aging in a large population study. The research involved approximately 7,500 participants whose data came from two sources: the Rhineland Study in Bonn, Germany, which included 6,470 individuals, and the EPIC-Potsdam Study, which contributed data from an additional 1,034 participants. The findings were published in Nature Communications.
Researchers investigated how closely participants adhered to 10 different dietary patterns, including the Mediterranean, Nordic, plant-based, and DASH diets. To measure biological aging rather than chronological age, scientists analyzed DNA methylation patterns in blood samples. This process involves chemical modifications to DNA that regulate gene activity and change in predictable ways as people age. The team utilized advanced technology to examine approximately 850,000 sites in the DNA, roughly double the number analyzed in most previous studies. They applied three different epigenetic clocks to estimate biological age based on these molecular signatures.
The analysis revealed that better adherence to each of the 10 diets was associated with slower biological aging, though some dietary patterns showed stronger associations than others. Notably, the absolute differences between diets were relatively modest. Researchers found that individuals who followed one diet well did not necessarily follow others well, reflecting the different nutritional emphases of each eating pattern. Despite these variations, the overall pattern was consistent across all dietary approaches examined.
The study identified shared biological pathways connecting the different diets to slower aging. More than 70 percent of the affected pathways were common across all 10 diets and involved essential cellular functions including structure, communication between cells, and metabolism. Some diet-specific differences emerged, such as the DASH diet showing associations with heart health pathways and the MIND diet demonstrating connections to cognitive function pathways.
An unexpected finding involved smokers, who showed stronger associations between healthier eating and slower biological aging compared to nonsmokers, despite not having healthier diets overall. Researchers suggested that the extensive damage caused by smoking may create greater opportunity for measurable health improvements through dietary changes, though the mechanisms remain under investigation. Scientists emphasized that multiple dietary approaches can support healthy aging rather than a single optimal diet.
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