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Episode Description

You can eat 30 grams of fiber a day and still be making the wrong choice for your microbiome. Because it was never just about how much you eat. It's about where that fiber is actually fermenting in your colon.

Dr. Karan Rajan is a surgeon, gut health expert, and one of the most followed doctors on the internet. He spent years operating on colon cancers and bowel disease before realizing the most powerful thing he could do was hand people the information they were never given. In this conversation he breaks down the gut in a way that will make you want to reorganize your entire kitchen by the time it's over.

In this episode, you'll discover:

• Why the old soluble vs insoluble fiber model is outdated and what fermentation geography actually means — and how eating only one type of fiber can cause gas and bloating even when you're hitting your daily target

• Why the protein obsession sweeping wellness culture may be quietly turning your gut bacteria into gremlins, and what happens when your microbes run out of fiber to eat

• How your microbiome can begin to change within 48 hours of increasing fiber intake, and the exact ramp up strategy Dr. Karan uses to avoid the gas and bloating that makes most people quit

If you have a gut, this episode is for you.

Find Dr. Karan:

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

TikTok: https://www.tiktok.com/@dr.karanr

YouTube: https://www.youtube.com/c/DrKaran

Book: This Is Vital Information — https://www.amazon.com/This-Vital-Information-Everything-Embarrassed-ebook/dp/B0FHC36WLD

Timestamps:

0:00 - Intro

1:58 - Meet Dr. Karan Rajan: Gut Surgeon Turned One of the Most Followed Doctors Online

3:02 - Rapid Fire: Ground vs. Whole Chia Seeds, the Gut-Skin Axis & How Often You Should Poop

9:03 - Why He Left Surgery to Educate Millions for Free

12:42 - The Microbiome: Medicine's "Dark Matter" (And Who's Really in Control)

15:22 - Could Your Microbiome Be Influencing Who You're Attracted To?

17:47 - The Gut-Brain Axis: Is Mental Health Treatment Missing a Huge Piece?

24:43 - What's Actually Exciting Right Now in Microbiome Science

29:47 - The Breakfast Swap That Changed His Life in Two Weeks

33:08 - Should You Be Eating More Like Your Ancestors?

35:54 - Fast, Medium & Slow Fermenting Fibers: Why It Matters Where Fiber Ferments in Your Colon

40:47 - Psyllium Husk, Chia Seeds & What Most Fiber Supplements Get Wrong

41:57 - The Best Foods for Your Microbiome (According to the Doc Who Studies It)

43:14 - Cooked and Cooled Starch & Why Freezing Bread Actually Works

44:07 - The Truth About Colonics: Helpful or Harmful? 46:41 - Your Microbiome Can Change Within 48 Hours — Here's How to Start

48:01 - The Fiber Fart Curve: Why Gas Is a Good Sign You're Doing It Right

50:33 - Why the Rise in Colon Cancer Is Directly Tied to Fiber Deficiency

51:42 - Too Much Protein, Not Enough Fiber: How You Turn Gut Bacteria Into Gremlins

56:27 - The Book & Why He Never Wants Anyone to Die of Embarrassment Again

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