# The Gut-Brain-Microbiome Axis: Understanding Depression, Serotonin, & Probiotics | HOMe Podcast #019

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Podcast: [Health Optimization Medicine Podcast](https://stenobird.com/podcast/health-optimization-medicine-podcast-5954129)
Published: 2026-07-22T15:30:00+00:00
Episode link: https://672d8edf-a640-45ce-ac61-cd5f898a7b27.libsyn.com/the-gut-brain-microbiome-axis-understanding-depression-serotonin-probiotics-home-podcast-019
Audio file: https://traffic.libsyn.com/secure/672d8edf-a640-45ce-ac61-cd5f898a7b27/HOMe_Podcast_019.mp3?dest-id=3824325
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Duration seconds: 1938

## Resource

In this episode of the Health Optimization Medicine Podcast, Dr. Ted Achacoso, Dr. Scott Sherr, Dr. Allen Bookatz, Dr. Jup Kuipers, and Jodi Duval take a deep dive into the gut-brain-microbiota axis. Moving past the simplistic, pathogenic "pill-for-an-ill" approach of conventional psychiatry and the mainstream hype around over-the-counter probiotics, the faculty breaks down why establishing enteric safety must always precede biochemical optimization. Join us as we delve into: The Tripartite Axis: How the enteric microbiota, gut barrier, and central nervous system communicate at a molecular and metabolomic level to dictate brain state and mood. Epigenetic Signaling: How gut microbes act as active metabolic factories, fermenting dietary fibers into short-chain fatty acids (SCFAs) like butyrate that cross the blood-brain barrier to upregulate BDNF and support synaptic plasticity. The IDO Serotonin Hijack: How gut-driven inflammation activates indolamine 2,3-dioxygenase (IDO), shunting tryptophan down the kynurenine pathway to produce neurotoxic quinolinic acid instead of serotonin and melatonin. The Microglial Fire: How circulating cytokines cross the blood-brain barrier at the circumventricular organs, placing the brain's microglia into an active defense state that triggers cognitive fatigue and brain fog. The 3-Phase Gut-Brain Protocol: Why seeding probiotics into inflamed soil fails, and how to logically sequence clearing overgrowth, rebuilding mucosal integrity with L-glutamine, and seeding validated strains. This episode is for you if: You are running on high-dose over-the-counter probiotics for mood issues but feeling no relief or worsening symptoms. You want to understand the exact cellular and biochemical mechanisms connecting leaky gut to leaky brain and psychiat…

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