Why 70% of Your Immune System Lives in Your Gut | Dr. Will Bulsiewicz

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Check out the full episode: https://greatness.lnk.to/1878DM

Your body is basically a crowded planet, and the gut is the capital city. Dr. Will Bulsiewicz drops the kind of perspective-shift that makes you sit up straight: around 38 trillion microbes live in you, and he paints a wild “football field” picture where almost all the genetic code in your body belongs to them. Then he connects the dots to why you might feel exhausted and inflamed: 70% of your immune system is stationed in the gut lining, right next to those microbes, separated by just a single layer of cells. When that gut barrier gets weak, unwanted stuff slips through, your immune system stays activated 24/7, and that chronic low-grade inflammation starts quietly wrecking the neighborhood.

The takeaway lands hard because it’s personal: your microbiome reflects your life. Food choices, sleep, circadian rhythm, exercise, connection with your partner, even old trauma patterns, all leave fingerprints in the gut. Instead of treating inflammation like a mystery enemy, this conversation nudges you to focus on the gate, the gut barrier, so your immune system doesn’t have to live on high alert. It’s a grounding way to think about healing: less panic, more rebuilding, and a reminder that small daily choices can move you from constant internal stress toward real, steady energy.

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