45. Your Gut, Your Brain & Your Performance: The Science Behind the Connection (Part 1)

Ever felt butterflies before a big presentation, or a stomach-drop when you're stressed? That's not "all in your head", it's the gut-brain axis at work. In this episode, we break down the science of how your brain and gut constantly talk to each other through the enteric nervous system, the vagus nerve, and the HPA axis. We cover why blood flow matters for digestion, how stress and cortisol shape your gut health, and why everyone's stress response looks different, plus practical takeaways on eating around workouts and managing chronic stress for better digestion.

5 Key Takeaways

1. The gut-brain connection is real and two-way. Your gut and brain constantly communicate through the enteric nervous system, vagus nerve, and hormone signalin, it's not "in your head," it's physiology.
2. Everyone's stress response is unique. Some people get stomach butterflies, others get chest pain or nausea, your gut-brain connection shows up differently than someone else's, and that's normal.
3. Blood flow timing affects digestion. During exercise, blood is diverted to your muscles; you need to wait for hunger cues (signaling blood flow has returned to your gut) before eating a full post-workout meal.
4. Cortisol isn't the enemy, dysregulation is. Cortisol should rise and fall throughout the day and spike appropriately with stress; the real problem is when it stays chronically elevated (or chronically too low).
5. Chronic stress blocks "rest and digest." Staying in sympathetic (fight-or-flight) mode prevents your parasympathetic system from supporting proper motility, secretion, and nutrient absorption.

"My point is recovery exists in all aspects of stress. Stress is actually a very positive thing. It's how we change. It's how we grow. It's just what we do afterwards to help recover from that in other forms."- Emily

Connect with Emily and AJ

Website: https://www.emilylevercoaching.com/

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

References

https://link.springer.com/article/10.1186/s44410-025-00011-9

https://pubmed.ncbi.nlm.nih.gov/31377851/

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Until next time—keep showing up, stay consistent, and remember: small steps add up to big change.