Ten Diets Tested on Seven Thousand People
Eating a healthy diet helps slow biological aging regardless of which specific eating plan a person follows, according to a study published in Nature Communications. Researchers at the German Center for Neurodegenerative Diseases (DZNE) examined dietary patterns and blood samples from approximately 7,500 individuals to track molecular signs of aging. The investigation evaluated 10 distinct dietary patterns, including the Mediterranean, Nordic, plant-based, and DASH diets.
Biological age measures the wear-and-tear of daily living on the body through chemical modifications to DNA, distinguishing it from chronological age. To measure these changes, the research team analyzed blood samples from 6,470 participants in the Rhineland Study in Bonn, Germany, and independently confirmed their findings using data from 1,034 participants in the EPIC-Potsdam Study. Investigators utilized state-of-the-art technology to cover about 850,000 sites in the DNA using three different epigenetic clocks, according to doctoral researcher and lead author Juliana Tavares.
DASH and Mediterranean Patterns Compared Against Cell Signaling
While every one of the 10 diets proved beneficial, the absolute differences in slowing biological age remained modest across the board. Participants who met the criteria for one healthy eating pattern frequently failed to meet the standards of another, meaning very few individuals counted as healthy eaters by every single standard simultaneously. Despite this variation, adherence to any of the 10 diets associated with slower aging. Dr. Monique Breteler, Director of Population Health Sciences at DZNE, stated that the effects are measurable and relevant for preventing age-related diseases such as dementia or cardiovascular disorders.
When investigating the underlying mechanisms, researchers discovered that more than 70% of the affected biological pathways were shared across all 10 dietary patterns. These shared pathways regulate cell structure, cell signaling, and metabolism. At the same time, a small subset of pathways remained diet-specific, matching the primary objectives of individual plans. Heart-related pathways showed up uniquely in association with the DASH diet, which was originally developed to reduce blood pressure, while pathways linked to cognition and memory appeared uniquely with the MIND diet.
Smokers Reveal Unexpected Responses to Healthy Eating Habits
An unexpected result emerged when investigators analyzed the link between diet and aging among smokers. The association between healthier eating and slower biological aging proved stronger in smokers than in nonsmokers, even though smokers did not generally report healthier diets. Tavares noted that while smoking remains very harmful to health, one explanation for this outcome is that smokers have a larger health benefit to gain from good nutrition because of the enormous detrimental effects of tobacco use.
Researchers have not yet determined the exact biological processes driving this difference, leaving open questions about cellular recovery mechanisms in tobacco users. However, the findings highlight a practical takeaway regarding daily food choices. Tavares emphasized that individuals do not need to maintain a perfect diet to see results, leaving room to tailor eating habits to personal preferences, budgets, and cultural traditions.
Frequently Asked Questions About Dietary Patterns and Biological Aging
What specific technology was used to measure biological aging in the study?
Researchers applied three different epigenetic clocks to read biological aging from DNA methylation using technology that covered about 850,000 sites in the DNA, according to Juliana Tavares at the German Center for Neurodegenerative Diseases.
How many participants were included in the primary analysis?
The initial analysis included 6,470 participants from the Rhineland Study in Bonn, Germany, with findings subsequently tested against data from another 1,034 people enrolled in the EPIC-Potsdam Study.
Which specific diets were included in the evaluation by DZNE researchers?
The German Center for Neurodegenerative Diseases investigated 10 different dietary patterns, which explicitly included the Mediterranean, Nordic, plant-based, and DASH diets.
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