General adherence to a healthy dietary pattern is associated with reduced epigenetic aging and distinct DNA methylation profiles that largely converge onto the same biological pathways, despite variations in dietary composition.
Key Findings
Results
There is minimal overlap among participants classified in the highest quartile of adherence across different diet quality scores.
Ten diet quality scores were examined for overlap in adherence
Participants in the top 25% (highest quartile) of one diet quality score largely did not overlap with top-quartile adherents of other diet quality scores
This finding was consistent across both the Rhineland Study and EPIC-Potsdam cohorts
The minimal overlap suggests that different healthy diet indices identify largely distinct subgroups of the population
Results
Adherence to healthy dietary patterns was associated with reduced epigenetic aging, though the magnitude of associations differed across diet quality scores.
Biological aging markers (epigenetic clocks) were used to assess the relationship between diet quality and aging
All ten diet quality scores showed associations with reduced epigenetic aging in the same direction
The strength of the associations varied depending on which diet quality score was used
Findings were validated in the EPIC-Potsdam cohort, supporting replication of the core association
Results
Different dietary patterns were associated with distinct DNA methylation profiles.
Epigenome-wide analyses were conducted using DNA methylation data from both cohorts
Each of the ten diet quality scores was associated with its own specific pattern of CpG methylation changes
Despite differences in the specific methylation sites involved, the profiles from different dietary patterns were not entirely divergent at the pathway level
The distinct methylation profiles reflect the different dietary compositions captured by each score
Results
The distinct DNA methylation profiles associated with different dietary patterns largely converged onto the same biological pathways.
Pathway enrichment analyses were performed on the differentially methylated positions associated with each diet quality score
Despite different dietary compositions and distinct CpG-level methylation patterns, the downstream biological pathways implicated were substantially shared across diet scores
This convergence suggests a common epigenetic mechanism through which varied healthy diets may exert health benefits
The authors conclude that 'general adherence to a healthy dietary pattern could promote health through similar epigenetic mechanisms, despite variations in dietary composition'
Methods
The study used two population-based cohorts to investigate diet–epigenome associations, with the Rhineland Study as the primary cohort and EPIC-Potsdam as the validation cohort.
The Rhineland Study is described as 'a large population-based cohort'
The EPIC-Potsdam cohort was used to validate findings from the Rhineland Study
Ten diet quality scores were evaluated in both cohorts
Both DNA methylation profiles and epigenetic aging markers were measured as outcomes
What This Means
This research suggests that eating a healthy diet — regardless of which specific healthy eating pattern you follow — may slow biological aging at the molecular level and influence gene activity through similar underlying mechanisms. The study examined ten different diet quality scoring systems (such as those based on Mediterranean, plant-based, or other recognized healthy eating patterns) and looked at how well people adhered to each, then compared this to markers of biological aging derived from DNA chemical modifications called methylation. A key practical finding is that these different scoring systems tend to identify different groups of people as 'high adherents,' meaning that scoring well on one healthy diet index does not necessarily mean you score well on another — the indices capture somewhat different eating behaviors.
Despite these differences in what counts as a 'healthy diet' under each scoring system, all ten were associated with slower epigenetic aging (a molecular measure of how quickly the body is aging biologically). Each dietary pattern was also linked to its own distinct pattern of changes in DNA methylation across the genome, but when researchers looked at which biological processes those changes affected, the answers largely overlapped — pointing to shared cellular and biological pathways regardless of which healthy diet was followed.
This research suggests that there may not be a single 'best' healthy diet for slowing biological aging at the epigenetic level; rather, multiple dietary approaches appear to work through similar molecular mechanisms even when their specific food recommendations differ. The findings were consistent across two independent European cohorts, strengthening confidence in the results. This could have implications for public health guidance, suggesting flexibility in dietary recommendations while still achieving similar biological benefits.
Tavares J, Liu D, Talevi V, Eichelmann F, Jannasch F, Schulze M, et al.. (2026). Associations between diet quality, epigenetic aging and epigenome in two population-based cohorts.. Nature communications. https://doi.org/10.1038/s41467-026-77064-4