The DAMA study: can a Mediterranean diet slow your epigenetic clock?
Earlier in this series, we explored the concept of biological age — the idea that your body can be ageing faster or slower than your chronological age, and that this difference is measurable through epigenetic clocks. We also established that accelerated epigenetic ageing is associated with increased cancer risk. A natural question follows: can lifestyle changes slow or reverse epigenetic age acceleration?
The DAMA study — a randomised controlled trial published in Aging Cell in 2021 by Fiorito and colleagues — provides some of the most direct evidence yet that a Mediterranean-style dietary intervention can produce measurable changes in epigenetic age in humans.
Background: epigenetic clocks and cancer
Epigenetic clocks measure biological age by examining DNA methylation patterns at specific sites across the genome. DNA methylation changes in predictable ways as we age, and algorithms trained on these patterns can estimate biological age with remarkable precision.
Accelerated epigenetic ageing — a biological age older than chronological age — has been associated with increased risk of multiple cancers. The Dugué and colleagues study, published in the International Journal of Cancer in 2017, found significant associations between accelerated epigenetic ageing and colorectal, lung, and blood cancers. If epigenetic age acceleration reflects underlying biological processes that increase cancer risk — chronic inflammation, accumulated oxidative damage, impaired DNA repair — then interventions that slow epigenetic ageing may plausibly reduce cancer risk.
The DAMA study design
The DAMA (Diet and Methylation Ageing) study was a randomised controlled trial conducted in Italy, enrolling adults at elevated cardiovascular risk. Participants were randomised to either a Mediterranean diet intervention or a control dietary pattern. The Mediterranean diet arm followed a well-defined protocol: high intake of vegetables, fruits, legumes, wholegrains, fish, and extra virgin olive oil; low intake of red and processed meat.
Epigenetic age was assessed at baseline and after the dietary intervention using established epigenetic clock algorithms applied to blood DNA methylation data. The primary outcome was change in epigenetic age acceleration — the difference between biological age as estimated by the epigenetic clock and chronological age.
What the study found
Participants in the Mediterranean diet arm showed a significant reduction in epigenetic age acceleration compared to the control group — a shift towards a younger biological age. The effect was proportional to dietary adherence: participants with the highest Mediterranean diet scores showed the largest reductions in epigenetic age acceleration. This dose-response relationship strengthens the case for a genuine dietary effect rather than a chance finding.
How a Mediterranean diet might slow epigenetic ageing
Methyl donor supply. DNA methylation requires methyl groups supplied by dietary methyl donors — folate, vitamin B12, choline, and betaine are the primary dietary sources. A Mediterranean diet rich in leafy vegetables, legumes, wholegrains, and fish provides abundant methyl donors, supporting the enzymatic processes that maintain healthy DNA methylation patterns.
Reduction in chronic inflammation. Chronic inflammation drives epigenetic age acceleration through oxidative DNA damage, altered methyltransferase activity, and disruption of methylation maintenance. The Mediterranean diet’s well-documented anti-inflammatory effects — mediated through polyphenols, omega-3 fatty acids, and fibre — may slow epigenetic ageing by reducing inflammatory burden on the epigenome.
Gut microbiome support. The gut microbiome produces butyrate and other short-chain fatty acids that influence DNA methylation patterns in host cells. A Mediterranean diet, with its high fibre and polyphenol content, supports a butyrate-producing microbiome.
Antioxidant protection. Oxidative damage to DNA can disrupt methylation patterns at damaged sites. The Mediterranean diet’s high antioxidant content — from olive oil polyphenols, vitamin C and E from fruits and vegetables, and selenium from wholegrains and fish — may protect against oxidative disruption of methylation patterns.
The Yaskolka Meir and DIRECT PLUS evidence
The DAMA study is not alone in this space. The Yaskolka Meir et al. study, published in Clinical Epigenetics in 2021, examined epigenetic age changes in participants of the DIRECT PLUS trial — which compared a Green Mediterranean diet (enriched with green tea and Mankai duckweed, both rich in polyphenols) to a standard Mediterranean diet and a healthy dietary guidelines control.
The DIRECT PLUS data found that the Green Mediterranean diet was associated with greater reductions in epigenetic age acceleration than the standard Mediterranean diet, with the polyphenol-enriched features appearing to drive additional benefit. A subsequent BMC Medicine paper from the same trial reported approximately 8.9 months of biological age attenuation associated with the Green Mediterranean diet over 18 months.
Contextualising against the Fitzgerald protocol data
The Fitzgerald et al. men’s RCT, published in Aging in 2021 (with a 2024 correction confirming the finding holds), examined a more intensive multimodal intervention — diet, methyl-donor supplements, exercise, sleep optimisation, and stress management — and reported a 3.23-year reduction in biological age over eight weeks. The women’s case series (Fitzgerald et al., Aging, 2023) enrolled only six participants and should be regarded as preliminary only.
The DAMA study is notable for being a randomised controlled trial focused specifically on diet. The Fitzgerald data suggests that diet combined with other lifestyle interventions produces larger effect sizes — consistent with the view that dietary pattern is one meaningful lever among several.
What this means in practice
Mediterranean diet adherence has measurable epigenetic effects in a randomised controlled trial. This is not observational association — it is experimental evidence that what you eat changes the way your DNA is methylated, in a direction associated with slower biological ageing.
Dietary adherence is the key variable. The dose-response relationship in the DAMA study means that partial adherence produces partial benefit. The degree of dietary shift matters.
Polyphenols amplify the epigenetic benefit. The DIRECT PLUS data suggests that polyphenol density — achievable by increasing green tea, berries, extra virgin olive oil, and polyphenol-rich vegetables — adds meaningful epigenetic benefit beyond the baseline Mediterranean pattern.
Methyl-donor foods are worth prioritising. Dark leafy greens (folate), eggs (choline), wholegrains (betaine), and oily fish and dairy (B12) supply the enzymatic substrate for healthy methylation maintenance.
What the evidence does not show
The DAMA study does not demonstrate that reducing epigenetic age acceleration through diet reduces cancer incidence. The causal chain — Mediterranean diet → reduced epigenetic ageing → lower cancer risk — is biologically coherent but has not been demonstrated in a prospective randomised trial with cancer as an outcome. The study also cannot establish whether the epigenetic changes are durable beyond the trial period.
The bottom line
The DAMA randomised controlled trial demonstrated that adherence to a Mediterranean dietary pattern produces a significant, dose-dependent reduction in epigenetic age acceleration — a shift towards younger biological age. The effect is biologically plausible, operating through methyl donor supply, anti-inflammatory mechanisms, gut microbiome support, and antioxidant protection. The DIRECT PLUS data extends this finding, suggesting that polyphenol density enhances the epigenetic benefit. Diet is not the only lever that influences epigenetic ageing, but the DAMA study provides direct experimental evidence that the right dietary pattern moves the needle in the right direction.
Scientific references
- Fiorito G, et al. DAMA study: Mediterranean diet and epigenetic ageing. Aging Cell. 2021. DOI: 10.1111/acel.13439
- Yaskolka Meir A, et al. Effect of polyphenol-rich dietary intervention on epigenetic age. Clinical Epigenetics. 2021. DOI: 10.1186/s13148-021-01038-0
- Dugué P-A, et al. Epigenetic clock and risk of cancer. International Journal of Cancer. 2017. DOI: 10.1002/ijc.31189
- Fitzgerald KN, et al. Potential reversal of epigenetic age using a diet and lifestyle intervention: a pilot randomized clinical trial. Aging. 2021. DOI: 10.18632/aging.202913. Note: 2024 correction DOI: 10.18632/aging.205700
This article is written for educational and informational purposes only. It is not intended as medical advice and should not be used to diagnose, treat, prevent, or cure any medical condition, including cancer. If you have a cancer diagnosis or are undergoing treatment, please discuss any lifestyle or dietary changes with your oncologist or medical team before making them. The studies cited reflect current research at the time of writing; the field is evolving rapidly and findings may be updated or superseded. Chloe Archard is a nutritional health coach, not a medical doctor.
