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Mike Gershon is a Professor of Pathology and Cell Biology at Columbia University and has been at the forefront of studying neural control of the gut for the past 60 years. In this episode, Mike gives a tour de force on the pathways of gut-brain communication but first sets the stage with an overview of gastrointestinal tract development and anatomy. He then explains how the gut communicates with the brain and vice versa, from early observations in physiology and anatomy up to our present understanding of what makes the GI tract so unique and complex relative to other organs. He talks about how the gut responds to meals of different food qualities and how that affects satiety signaling to the brain. Additionally, he explains how antidepressants and other drugs impact digestion through effects on serotonin signaling, and he discusses the effects of antibiotics, and what’s really going on with “leaky gut.” Finally, Mike offers his thoughts on the utility—or lack thereof—of gut microbiome diagnostic tests, and wraps up the discussion by considering how diet, probiotics, and prebiotics impact the microbiome and GI tract.
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