IBS Is Not Psychological: Gut-Brain Disease

In this episode, I sit down with Dr. Trisha Pasricha, a Harvard-trained gastroenterologist who directs the Gut-Brain Research Lab at Beth Israel, to reveal why IBS isn't "all in your head" and how specialized antibody testing can uncover autoimmune attacks on gut neurons. We explore the IBS-fibromyalgia overlap, why one in three people develop IBS after infections, and her groundbreaking research showing smartphone scrolling in bathrooms increases hemorrhoid risk by 46%.

Dr. Pasricha shares evidence-based treatments including peppermint oil and psyllium fiber while debunking probiotic myths, and explains why constipation may be an early Parkinson's warning sign. This conversation validates patients dismissed by doctors and proves these conditions have real pathology requiring collaborative care across specialties.

Key Takeaways

1. IBS is NOT "all in your head"—pathology lives in the deep enteric nervous system where standard tests can't reach
2. 90% of gut-brain communication flows UPWARD through the vagus nerve, not downward from stress
3. One in three people who get gastroenteritis will develop IBS from "scarring" of gut neurons
4. The Mayo Paraneoplastic Panel can detect autoimmune antibodies attacking gut neurons (specialized test)
5. Many IBS patients also have fibromyalgia—treatments often overlap (SNRIs, peppermint oil, fiber)
6. Psyllium fiber (25g women, 38g men daily) works for BOTH constipation and diarrhea—it's a "shapeshifter"
7. Probiotics are NOT recommended by gastroenterology guidelines—feed your microbiome with fiber and fermented foods instead
8. Smartphone scrolling in the bathroom increases hemorrhoid risk by 46%—limit to 5 minutes maximum
9. Constipation may be an early Parkinson's warning sign—the disease likely begins in the gut
10. H. pylori is abnormally prevalent in Parkinson's patients and treating it can improve tremors by enhancing levodopa absorption

Chapters & Timestamps

00:00 Introduction to Dr. Trisha Pasricha & Gut-Brain Research

02:00 What Is IBS & Why It's Not "All in Your Head"

04:00 The Enteric Nervous System: Our "Second Brain"

07:00 The Autoimmune Connection to IBS

10:00 IBS-Fibromyalgia Overlap & Treatment Crossover

13:00 Mayo Paraneoplastic Panel: Testing for Autoimmune IBS

16:00 Getting Second Opinions & Finding Neuro-GI Specialists

19:00 Social Media Education: Benefits & Rabbit Holes

21:00 Evidence-Based Treatments: Peppermint Oil & Psyllium Fiber

26:00 The Truth About Probiotics: Not Recommended

29:00 Fiber Diversity & the Mediterranean Diet Connection

33:00 Groundbreaking Research: Smartphones & Hemorrhoids (46% Risk)

36:00 Parkinson's Disease Begins in the Gut

38:00 The GI-Neuro Parkinson's Clinic Model

42:00 H. Pylori Connection to Parkinson's & Rheumatic Diseases

45:00 Post-Infectious IBS & Reactive Arthritis Parallels

47:00 Dr. Pasricha's Book & Where to Find Her

Guest Details

Dr. Trisha S. Pasricha, MD

Board-Certified Gastroenterologist & Neuro-GI Specialist

Credentials & Training:

1. Board Certified in Gastroenterology
2. Harvard Medical School trained
3. Johns Hopkins trained
4. Fellowship in Neuro-Gastroenterology (Gut-Brain Connection & Motility)
5. Director of Gut-Brain Research Lab at Beth Israel Deaconess Medical Center, Boston
6. Medical Columnist, The Washington Post (weekly Monday column)

Research & Publications:

1. Published in New England Journal of Medicine, JAMA, Nature Reviews
2. Leading research on IBS, gut-brain axis, and Parkinson's disease gut origins
3. Groundbreaking studies on smartphone use and GI health
4. Expert in autoimmune causes of GI motility disorders

Specializations:

1. Irritable Bowel Syndrome (IBS) and its autoimmune etiologies
2. Neuro-gastroenterology and enteric nervous system disorders
3. Gut-brain connection and vagus nerve communication
4. Parkinson's disease gastrointestinal manifestations
5. Gastroparesis and GI motility disorders
6. Fibromyalgia-IBS overlap syndrome
7. Post-infectious IBS and reactive gut disorders
8. Joint hypermobility syndromes with GI involvement
9. Interdisciplinary care for complex patients

Author: "You've Been Pooping All Wrong" (Release date: April 7, 2026)

Clinical Philosophy: Dr. Pasricha is passionate about validating patients who've been dismissed with "it's all in your head" and proving that IBS and related conditions have real, measurable pathology in the deep layers of gut tissue that standard tests can't reach. She emphasizes that 90% of gut-brain communication flows upward from the gut through the vagus nerve, not downward from stress, and she takes exhaustive patient histories to uncover triggers like infections, autoimmune connections, or trauma. She strongly advocates for second opinions, encourages social media education (with medical guidance), and believes in treating pain at both the peripheral (gut) and central (brain) levels while being transparent about why certain medications like SNRIs work for pain independent of mental health. Her research lab is pioneering work on how Parkinson's disease may begin in the gut years before motor symptoms appear, and she runs an innovative interdisciplinary clinic with neurologists to treat the whole patient.

Connect with Dr. Trisha Pasricha

Instagram: @trishapasrichamd

Column: The Washington Post (Mondays)

Book: "You've Been Pooping All Wrong" (Available April 7, 2026)

Practice: Beth Israel Deaconess Medical Center, Boston, MA

Note: Due to high demand, securing an appointment may be challenging. Dr. Pasricha recommends finding a neuro-gastroenterologist or motility specialist closer to home who can partner with you on your care journey.

About Your Host

Dr. Micah Yu, DC, CFMP

Functional Medicine Practitioner & Host of AutoImmune Alchemy

Dr. Micah Yu is a doctor of chiropractic and certified functional medicine practitioner specializing in autoimmune conditions and chronic illness. He recognizes mold exposure as a common root cause of autoimmune disease, particularly in patients with long-haul COVID who suddenly develop mold sensitivities. Dr. Yu is passionate about educating his community on environmental toxins and bringing expert voices like John Banta to help patients understand the hidden triggers affecting their health. He practices integrative medicine with his wife, creating a dynamic team dedicated to uncovering root causes and supporting patients on their healing journey.

About AutoImmune Alchemy Podcast

Mission: Blending science with soul to transform autoimmune struggles into healing alchemy

AutoImmune Alchemy is a podcast dedicated to the autoimmune community, offering hope, validation, and evidence-based solutions for those struggling with complex chronic conditions.

Hosted by Dr. Micah Yu, the show explores root causes like mold exposure, infections, and environmental toxins that traditional...