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Summary
On episode 526 of 40+ Fitness, Coach Allan sits down with Dr. Kara Fitzgerald, a naturopathic doctor and DNA methylation researcher who received the first Emerging Leadership Award from the Personalized Lifestyle Medicine Institute, and the author of Younger You: Reduce Your Bio Age and Live Longer, Better.
Kara explains the difference between chronological age (how many years you’ve been alive) and biological age (how much wear and tear your body actually shows), and how epigenetics, specifically a process called DNA methylation, regulates which genes get expressed. Genes aren’t simply on or off, they behave more like dimmer switches, and diet and lifestyle turn those dimmers up or down.
The conversation covers her formula of methyl donor foods plus methylation adaptogens plus lifestyle practices, her keto-leaning, 12-hour time-restricted eating approach, and the results from her clinical study: an 8-week program that reversed participants’ biological age by more than three years.
Links
- https://youngeryouprogram.com
Key Takeaways
- Biological age is different from chronological age, and it can be measured and changed. Chronological age just counts years lived, while biological age reflects physiological wear and tear, and Fitzgerald’s research shows it can be tracked and shifted through DNA methylation markers.
- Genes work more like dimmer switches than on/off switches. Epigenetics, the layer of regulation above your genetic code, determines how strongly a gene like a tumor suppressor gets expressed, and diet, stress, toxins, and lifestyle all turn that dial.
- DNA methylation drives over 300 biochemical reactions in the body. It requires methyl donor nutrients (leafy greens, eggs, beets, liver, mushrooms) plus adaptogen compounds (green tea catechins, curcumin, resveratrol, sulforaphane) that direct where those methyl groups go.
- Her 8-week intensive program reversed biological age by more than 3 years in her clinical study. It combines methyl donor and adaptogen-rich whole foods, 12-hour time-restricted eating, a greens powder, and one specific probiotic strain, without calorie restriction or heavy supplementation.
- Alcohol shuts down methylation. Fitzgerald recommends cutting alcohol entirely during the 8-week intensive; outside of that window, she suggests keeping it modest and favoring lower-glycemic choices like dark red wine.
- Folic acid isn’t the same as usable folate. Synthetic folic acid has to be converted into a bioidentical form the body can use, people convert it with varying efficiency, and unconverted excess can become its own problem.
- Sleep, exercise, stress, and social connection show up in your DNA methylation, not just how you feel. Poor sleep is linked to accelerated aging markers, and even the timing of exercise (morning versus late in the day) changes sleep quality and recovery.
- Dr. Fitzgerald’s three strategies to get and stay well: get into the driver’s seat of your genetic expression by feeding your genes methyl donors and adaptogens through real food; prioritize sleep and exercise; and build community and connection.
“When you give your body what it needs without beating it over the head with pharmaceuticals and synthetic hormones, you empower your body’s own innate wisdom to lead the way.”
Dr. Kara Fitzgerald
Another Episode You May Enjoy
Episode 536 – How to turn back the clock on your true age with Dr. Morgan Levine