Gut Health After 40: 4 Science-Backed Ways to Fix Your Microbiome | Dr. Karen Corbin | #148

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I've spent years focusing on your external mobility, but I've become obsessed with the world living inside you. We used to think of the gut as just a digestion tube; now we know it's a thriving ecosystem and a metabolic pharmacy that dictates your weight, mood, and longevity. If you're doing "everything right" but still struggling with energy, the issue isn't your willpower, it's your microbiome.

In this episode, I sit down with researcher Dr. Karen Corbin to decode the gut's "black box." We're moving beyond basic digestion to explore how fiber triggers the same satiety hormones as modern weight-loss injections. Stop viewing food as mere calories and start seeing it as fuel for your internal garden. It's time to stop fighting your biology and start partnering with your bacteria to design a resilient future from the inside out. What we cover: - How your gut bacteria produce Butyrate, a "magic" compound that heals the gut and lowers inflammation.

- The science of how fiber and resistant starch signal your brain to feel full and satisfied.

- Why ultra-processed foods are "too easy" for our bodies to digest, leading to metabolic disaster.

- Why "industrial milling" is the hidden enemy of metabolic health, turning even "healthy" grains into rapid glucose spikes by making them too easy to digest. - Why your choices at dinner determine your blood sugar response to breakfast the next morning, proving that your microbiome works on a 12-to-24-hour cycle.

- Understanding that because every person's "internal garden" is unique, the same "healthy" food can cause a sugar spike in one person while keeping another perfectly stable.

- Exploring the deep connection between the health of your microbiome and the energy-producing engines in your cells that drive your vitality.

About Dr Karen Corbin:

Dr. Karen Corbin is a PhD researcher and keynote speaker at the forefront of precision nutrition with Advent Health. She has dedicated her career to decoding the "black box" of the microbiome, revealing how our internal pharmacy dictates metabolic health and longevity.

Connect with Dr Karen Corbin: LinkedIn: linkedin.com/in/karen-corbin-phd-rd-75229111

Website: https://www.geeksthatspeak.com/ Timestamps 00:00 Intro

01:46 Meet Your Microbes: The Colon as a Metabolism 'Show'

05:58 How the Microbiome 'Talks' to You: SCFAs, Bloodstream & the Vagus Nerve

09:28 Feed the Good Guys: Fiber, Mucus Barrier & 'Leaky Gut' Explained

14:23 Aging, Exercise, Antibiotics & Hormones: What Changes in Perimenopause

18:27 Prebiotics vs Probiotics vs Synbiotics: Yogurt, Capsules & What Actually Helps

22:24 Can You Test Your Microbiome? The Limits of Diagnostics & Expensive Probiotics

27:29 Diet Can Remodel Your Gut: The 4 Research-Backed Levers

32:12 Does Food Order Matter? + CGM Lessons on Carbs, Protein, and Spikes

35:48 Practical Breakfast Upgrades: Oats, Flax, Nuts, and Easy Wins

37:00 Calories Aren't One-Size-Fits-All: Microbes, Absorption, and Weight Differences

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