Stress & The Gut: The Vicious Loop
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Stress & The Gut: The Vicious Loop
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Stress doesn't just feel bad — it physically rewires your gut. And your gut sends the stress right back. Here's the loop, and how to break it.
A stressful week happens, and a few days later your stomach is a mess. That's not a coincidence — it's a specific, measurable, bidirectional loop between your brain and your gut.
In this episode, Dave breaks down exactly how stress physically changes your gut microbiome, how a disrupted gut sends signals back that amplify your stress response, and where you actually have the leverage to interrupt the cycle.
What you'll learn:
- How cortisol and fight-or-flight physically alter gut motility and microbiome diversity
- Why chronic stress can reduce microbial diversity within days
- How gut disruption feeds back into the brain via the vagus nerve
- Why anxiety and IBS are two views of the same feedback loop
- Two practical entry points for interrupting the stress-gut cycle
Research referenced:
- Karl et al. (2018), American Journal of Physiology — stress, microbial diversity, and intestinal permeability
- Cryan Lab, University College Cork — stress-induced microbiome changes and anxiety-like behavior
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