Can you influence your epigenetic age through diet?

People with a healthier diet score lower on epigenetic ageing clocks on average, including the GrimAge clock, which is a strong predictor of mortality risk and cardiovascular disease. This is a consistent pattern across multiple observational studies. However, bear in mind that these are associations at the population level. You cannot reliably conclude from this whether changing your diet will personally turn back your clock.

There is one small randomised trial that goes beyond a mere association. In it, 43 healthy men between the ages of 50 and 72 followed an intensive eight-week programme involving a specific diet, sleep coaching, exercise, relaxation, probiotics and additional phytonutrients. At the end, their epigenetic age was on average 3.23 years lower than that of the control group. That sounds concrete, but the study has clear limitations: it was small, lasted only eight weeks, included only men, and two of the researchers had a financial interest in the programme. Furthermore, the reduction within the intervention group itself did not reach the threshold for statistical significance.

On the other hand, the same review studies show that a Western dietary pattern, excess weight and low levels of physical activity are associated with accelerated epigenetic ageing. This makes it biologically plausible that diet works in both directions, even though the causal evidence is still limited.

Which specific diet works most powerfully cannot be determined conclusively from the available studies. The combined programme in the RCT contained so many components simultaneously that it is impossible to isolate which one contributed most. The mechanisms involved and their translation into practical lifestyle advice are still very much the subject of ongoing research.