Episode 71: The Root Cause of IBS — Interview with Izabella Wentz, PharmDWhat if IBS isn’t a true diagnosis—but a placeholder? What if bloating, cramping, urgency, constipation, diarrhea, and food reactions aren’t signs that your body is “too sensitive,” but clues that something specific and treatable is being missed? In this episode of the Autoimmune Wellness Podcast, I’m joined by Dr. Izabella Wentz, integrative pharmacist, bestselling author, and longtime leader in the root-cause approach to chronic illness. Many of you know her work in the Hashimoto’s community—but her newest book turns that same investigative lens toward digestive health. Izabella’s latest book, Finding and Treating the Root Cause of Irritable Bowel Syndrome, challenges the idea that IBS is a final answer. Instead, she reframes it as the beginning of a deeper investigation—one that considers bacterial overgrowth, enzyme deficiencies, nutrient depletion, intestinal permeability, medication side effects, food intolerances, thyroid dysfunction, and more. This conversation is especially relevant for the autoimmune community. Many people who go on to develop autoimmune disease report years—sometimes even a decade—of digestive symptoms before receiving a diagnosis. We explore why that overlap exists, what IBS may be masking, and how improving gut health may shift the trajectory of long-term immune health. In this episode, you’ll learn:Why IBS is often a “label,” not a root causeThe research showing most IBS cases have identifiable, treatable drivers How IBS can precede autoimmune disease by 5–10+ years The role of intestinal permeability in autoimmunity When IBS may actually be SIBO, celiac disease, IBD, enzyme dysfunction, or something else The difference between IBS and IBD—and red flags you shouldn’t ignore How nutrient deficiencies like zinc, glutamine, thiamine, carnitine, and magnesium impact digestion Why fiber works for some people—and makes others worse How polyphenols, fermented foods, and microbiome balance fit into healing Medications that can contribute to constipation, diarrhea, or gut lining damage Foundational gut practices that support digestion for everyone Resources:Izabella Wentz, PharmD Website: https://thyroidpharmacist.com Instagram: @izabellawentzpharmd Facebook: Thyroid Lifestyle Podcast: Thyroid Pharmacist Healing Conversations Book: Finding and Treating the Root Cause of Irritable Bowel Syndrome Episode Timeline:00:00 – Is IBS a diagnosis—or a placeholder? 01:34 – Introducing Izabella Wentz 03:38 – Why IBS is often a label, not a root cause 11:07 – When IBS is actually something else 14:01 – Food reactions: IBS vs autoimmune sensitivities 18:35 – Why IBS and autoimmunity overlap 20:10 – IBS vs IBD: knowing the difference 23:09 – Nutrient deficiencies and digestive dysfunction 28:40 – Fiber, fermented foods & polyphenols 32:56 – Medications that contribute to IBS 35:08 – Gut health foundations for everyone 38:12 – Wrap-up and closing
