Your biological age can drop by over three years in just eight weeks, and the tools to do it are already in your kitchen. This episode breaks down the cutting-edge science of methylation, polyphenols, Yamanaka mimetics, and epigenetic reprogramming that is rewriting what we know about anti-aging, longevity, and human performance.
Host Dave Asprey sits down with Dr. Kara Fitzgerald, ND, IFMCP, a leading voice in functional medicine and epigenetic aging research. Her award-winning clinical studies published in Aging (2021, 2023, and 2025) proved that targeted diet and lifestyle interventions can measurably reverse biological age on validated epigenetic clocks. She is the author of Younger You, an IFM faculty member and Certified Practitioner, and one of the most rigorously credentialed researchers working at the intersection of functional medicine, nutrition, and longevity science today.
Together, they go deep on Yamanaka factors, the Nobel Prize-winning discovery that can wind back a 90-year-old cell to its 20s, and the emerging class of compounds called Yamanaka mimetics, polyphenol-based supplements that may replicate some of those same cellular rejuvenation effects without the risks. They cover why polyphenols do the heavy lifting in biological age reversal, how AI is accelerating longevity research, and why the dark matter of nutrition may matter more than macros, carnivore protocols, or ketosis for long-term health. They also get into oxalates, mitochondria, fibroids, ovarian rejuvenation, and why the original Horvath clock may be more relevant than scientists thought.
You’ll Learn:
-How diet, supplements, and meditation reversed biological age by over three years in eight weeks in a randomized controlled trial
-What Yamanaka factors are and why scientists are calling partial cellular reprogramming the future of anti-aging
-Which polyphenols do the heaviest lifting for epigenetic rejuvenation, including EGCG, urolithin A, rosemary, marjoram, and yarrow
-Why the Horvath epigenetic clock may actually be touching on programmatic aging rather than just exposomic wear and tear
-How AI is unlocking patterns in longevity data that no human researcher could find alone
-The problem with high-oxalate superfoods and how to get polyphenol benefits without the inflammatory downside
-Why ovarian rejuvenation may be the highest-leverage Yamanaka application for women’s longevity and brain health
-How compounds like AKG, sodium butyrate, and forskolin may act as Yamanaka mimetics already available today
-What the PRC2 polycomb clock reveals about programmatic aging and why it matters more than second-generation clocks
-Why perimenopause does not have to be painful, and how functional medicine addresses it at the root
Resources:
• Learn more about all of Dr. Fitzgerald’s work at: https://www.drkarafitzgerald.com/
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Timestamps:
00:00 – Trailer
01:28 – Explaining Study
03:45 – What Is The Diet
06:49 – Age Reversal
08:17 – Polyphenols vs. Supplements
09:27 – Food vs. Supplement Dosing
12:41 – Oxalate & Polyphenol Trade-offs
18:41 – Yamanaka Factors Explained
28:59 – Chemical Cocktails
32:15 – PRC2 Clocks & Programmatic Aging
40:28 – Seasonal Eating
43:40 – Carnivore Diet: Short vs. Long Term
45:31 – Inuit Diet
46:39 – Flavones & Brain-Crossing Compounds
48:50 – Why Only Men in the Study?
51:05 – Women, Perimenopause & the Protocol
53:20 – Fibroids & Gaps in Women’s Research
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