Forget the idea that there is only one “perfect” diet for healthy aging. New research suggests that eating a generally healthy diet may be more important for slowing biological aging than following one specific eating plan.
A study published on August 29 in Nature Communications examined the relationship between 10 different dietary patterns and epigenetic aging, a measure of biological aging based on changes to DNA. Researchers found that people who followed healthier eating patterns tended to show slower epigenetic aging, although the strength of the association varied between diets.
The researchers analyzed data from two population-based cohorts in Germany: the Rhineland Study and the EPIC-Potsdam cohort. Together, the analysis included roughly 7,500 participants, allowing the researchers to examine dietary habits alongside biological markers of aging.
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Researchers Looked at 10 Different Healthy Diets
Rather than focusing on a single eating plan, the researchers compared 10 dietary quality scores, including the Mediterranean diet, DASH diet, MIND diet, Nordic diet, the EAT-Lancet diet and several plant-based eating patterns.
The study found surprisingly little overlap among people who ranked in the top 25% for adherence to the different diets. In other words, someone could score highly on one healthy diet without necessarily following another healthy eating pattern closely.
Despite those differences, higher adherence to healthy dietary patterns was consistently associated with reduced epigenetic aging.
“While there are measurable differences between the diets, they are modest in absolute terms. It’s the big picture that matters,” lead researcher Juliana Tavares said in a statement from the German Center for Neurodegenerative Diseases.
What Does Healthy Eating Have to Do With Aging?
To investigate biological aging, researchers examined DNA methylation, a chemical process that can influence how genes function. Certain DNA methylation patterns change as people age and can be used by researchers as markers of biological age.
The researchers used three different “epigenetic clocks” to assess biological aging and analyzed approximately 850,000 sites across participants’ DNA. The findings were then independently examined in the EPIC-Potsdam cohort.
Although the different diets produced distinct DNA methylation patterns, researchers found substantial overlap in the biological pathways associated with them.
More than 70% of the affected biological pathways were shared across the dietary patterns studied, including pathways involved in cell structure, cell signaling and metabolism—processes that play important roles in aging and chronic disease.
Mediterranean Diet and DASH Aren’t the Only Options
The findings do not suggest that popular diets such as the Mediterranean or DASH diets are ineffective. Instead, they suggest that several different approaches to healthy eating may be associated with slower biological aging.
The DASH diet, for example, showed associations with pathways related to cardiovascular health, while the MIND diet showed diet-specific associations involving cognition and memory.
That could be encouraging for people who struggle to stick to one rigid eating plan. “You don’t need a perfect diet—that may be the most practical message here,” Tavares said.
Researchers noted that the various dietary patterns share many characteristics, such as emphasizing nutritious foods, even though their specific recommendations differ.
The Findings Don’t Mean Diet Can Stop Aging
Importantly, the study looked at associations between diet quality and biological aging rather than proving that a particular diet directly causes people to age more slowly.
The researchers also described the effects as measurable but not massive. Their findings suggest that consistently eating a healthier overall diet may be linked to biological markers associated with slower aging, but they do not establish that changing your diet will literally reverse aging or prevent age-related disease.
Still, the researchers say the results point toward a broader approach to nutrition—one that focuses less on finding a single “best” diet and more on improving overall diet quality.
“When it comes to slowing down the aging process, there isn’t just one healthy diet, but indeed a whole repertoire of possible diets with a positive effect,” Tavares said.
