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EPISODE 05
•
Microbiome-Gut-Brain Axis

Nutrition, Gut Health & Brain Vitality

How the microbiome and nutritional choices directly communicate with neural circuits to optimize cognitive longevity and emotional well-being.
  • 19 Min Listen
  • Maya Lin
  • Dr. Sophia Reyes, PhD
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FEATURED GUEST
Nutritional Neuroscience

Dr. Sophia Reyes, PhD

Chair of Microbiome & Psychoneuroimmunology
“Over 90% of peripheral serotonin and critical short-chain fatty acids originate in the gut, communicating directly with the brain via the vagal superhighway.”
Columbia University • 40+ Publications on Gut-Brain Axis

Key Episode Takeaways

SUMMARY
  • Vagal Signaling: Microbial metabolites such as butyrate and propionate directly influence microglial activation and neuro-inflammation.
  • Polyphenols & Blood-Brain Barrier: Fermented botanical foods and prebiotic fibers reinforce tight junctions in both the gut and brain barriers.
  • Stress-Induced Dysbiosis: Emotional stress alters microbial diversity; restoring gut balance directly alleviates anxious brain states.

Host: Did you know over 90% of serotonin receptors are located in the digestive tract? Today we explore the profound bidirectional highway called the gut-brain axis.

Dr. Guest: The enteric nervous system communicates continuously with the central nervous system via the vagus nerve. The metabolites produced by our gut microbes, particularly short-chain fatty acids, directly modulate blood-brain barrier integrity and neuroinflammatory tone.

Host: What foods provide the strongest neurological foundation?

Dr. Guest: Diverse plant polyphenols, omega-3 fatty acids from marine or seed sources, and fiber-rich prebiotics that nourish beneficial microbial strains.

Episode Transcript

Complete dialogue transcript from this recording
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Host: Did you know over 90% of serotonin receptors are located in the digestive tract? Today we explore the profound bidirectional highway called the gut-brain axis.

Dr. Guest: The enteric nervous system communicates continuously with the central nervous system via the vagus nerve. The metabolites produced by our gut microbes, particularly short-chain fatty acids, directly modulate blood-brain barrier integrity and neuroinflammatory tone.

Host: What foods provide the strongest neurological foundation?

Dr. Guest: Diverse plant polyphenols, omega-3 fatty acids from marine or seed sources, and fiber-rich prebiotics that nourish beneficial microbial strains.

Scientific References & Citations

  • Cryan, J. F., et al. (2019). The Microbiota-Gut-Brain Axis. Physiological Reviews, 99(4), 1877–2013.
  • Foster, J. A., & Neufeld, K. A. M. (2013). Gut-brain axis: how the microbiome influences anxiety and depression. Trends in Neurosciences.
THE PROGRAM

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