The DUTCH Podcast Reversing Biological Age: The Science of Polyphenols, Methylation & Longevity
Jan 6, 2026
Dr. Kara Fitzgerald, naturopathic physician and researcher focused on epigenetics and biological age reversal. She discusses an eight-week diet and lifestyle trial that reversed epigenetic age. Conversation highlights polyphenols, urolithin A and the microbiome, methylation dynamics, and how stress amplifies aging. Practical focus on diet over pills and when supplements may help.
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Lifestyle Can Reverse Epigenetic Age
- Dr. Kara Fitzgerald showed an eight-week diet and lifestyle program reversed biological age by over three years versus control.
- This demonstrates that biological age (epigenetic clock) can be rapidly and meaningfully changed with non-pharmaceutical interventions.
Prescribe A Polyphenol + Methyl Donor Diet
- Use a methyl-donor–rich, polyphenol-dense dietary pattern with adequate protein and fat to favorably change gene expression.
- Combine diet with exercise, meditation, and good sleep for maximal epigenetic benefit.
Polyphenols Drive Epigenetic Change
- Polyphenols did most of the 'heavy lift' in rearranging the Horvath epigenetic clock toward a younger pattern.
- High-polyphenol diets like Mediterranean patterns are being validated as epigenetically beneficial.
