69. Dr. Kara Fitzgerald: This Hack Reversed Biological Age by 3 Years in Just 8 Weeks

What if aging isn’t just inevitable—but programmable?

In this episode of Extend, I sit down with Dr. Kara Fitzgerald, pioneering epigenetic researcher and author of Younger You, to explore how your daily choices—food, movement, sleep, stress—can literally rewire your genes to slow down aging. We unpack her groundbreaking study showing biological age reversal in just 8 weeks without drugs, injections, or extreme protocols.

You’ll learn how DNA methylation impacts everything from inflammation to longevity, which “epinutrients” flip your genes in the right direction, and why your salad might be more powerful than your supplement stack.

Dr. Kara Fitzgerald is a functional medicine physician. Her clinical trial was the first to show biological age reversal through diet and lifestyle alone. She’s also the author of Younger You.

Let’s get into it.

We Also Discuss:

• How she helped reverse biological age in 8 weeks

• The one test that reveals how fast you’re actually aging

• Can food really reprogram your genes? (Spoiler: yes)

• Why folate, B12, and mushrooms might be more powerful than your multivitamin

• The “epinutrients” your aging cells are starving for

• Why your salad might be more effective than supplements

• Is the carnivore diet speeding up your biological age?

• What Yamanaka factors, vitamin D, and plasma exchange mean for your future

Thank You to Our Sponsors:

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Learn more about Dr. Shah:

Website: https://www.drshah.com/

Clinic: https://www.next-health.com/

Instagram: https://www.instagram.com/darshanshahmd/

 

Learn more about Dr.Kara Fitzgerald: 

 

Website: https://www.drkarafitzgerald.com/ 

Instagram: @drkarafitzgerald 

Book: Younger You