113. Dr. Karan Rajan: Why Gut Health Shapes Your Longevity

Extend Podcast with Darshan Shah, MD · Nov 18, 2025 · 1h 12m

You can eat healthy, exercise daily, and still struggle with fatigue, inflammation, or brain fog. Why? Because every system in your body is connected. The gut, brain, and immune system are constantly communicating, and most health plans ignore that network.

In this episode of Extend, I sit down with Dr. Karan Rajan to explore how the gut microbiome shapes everything from digestion and immunity to mood, skin, and longevity. We unpack the science behind leaky gut, fiber diversity, fermented foods, and the connection between microbiome imbalance and chronic inflammation.

We also dive into…