Know Thyself E175 - Dr. Will Bulsiewicz: How Stress, Trauma, and Modern Life Break Your Gut & How To Restore Balance
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Dec 9, 2025 
Dr. Will Bulsiewicz, a renowned gastroenterologist and author, reveals the critical connection between gut health and our emotional well-being. He discusses how modern life’s stressors and environmental toxins disrupt our microbiome, leading to chronic inflammation and fatigue. Will highlights the importance of mindful eating, emphasizing real food, fiber, and gut-friendly practices. He also explores how societal pressures contribute to individual health challenges, urging listeners to take ownership of their wellness through holistic approaches.
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Gut Feelings Are Biological Signals
- The vagus nerve sends massive gut input to the brain, underpinning 'gut feelings.'
- About 80% of vagal fibers carry gut-to-brain signals, making intuition partly visceral sensing.
Gut Neurochemistry Guides Sleep And Immunity
- The gut makes many neurotransmitters: ~30 types, 95% of serotonin, ~50% of dopamine.
- Gut-produced serotonin becomes melatonin at night and deeply links gut, sleep, and immune rhythms.
Gut Lining As A First Immune Shield
- The gut lining is a primary immune organ powered by butyrate from fiber-producing microbes.
- A strong gut barrier prevents innate immune activation and downstream chronic inflammation.
