In today's episode, Haylie Pomroy sits down with Dr. Theoharis Theoharides — Professor of Clinical Immunology and Executive Director of the Center for Excellence in Neuroinflammation Research — to dig into a topic that's finally getting the attention it deserves: multiple chemical sensitivity (MCS) and its deep connection to mast cell activation.

Dr. Theoharides explains what actually happens in the immune system when the body is exposed to everyday chemicals — from perfume and jet fuel to formaldehyde in clothing and mycotoxins in food. He walks through the biology of mast cells, why stress dramatically lowers your chemical reaction threshold, and why so many patients go undiagnosed or are dismissed as "just sensitive."

Haylie brings her own personal experience with chemical sensitivity and autoimmune disease to the conversation, making this one of the most candid and clinically rich discussions we've had on the show. Whether you've been told your symptoms are in your head, or you've quietly suspected that your environment is making you sick, this episode is for you.

Tune in to Fast Metabolism Matters — and finally get the science to back up what your body has been telling you all along.

Dr. Theoharis Theoharides is a Professor, Vice Chair of Clinical Immunology, and Director at the Institute for Neuro-Immune Medicine-Clearwater, an Adjunct Professor of Immunology at Tufts School of Medicine, where he was a Professor of Pharmacology and Internal Medicine, and also the Director of Molecular Immunopharmacology & Drug Discovery, and Clinical Pharmacologist at the Massachusetts Drug Formulary Commission (1983-2022). He received his BA, MS, MPhil, PhD, and MD degrees and the Winternitz Price in Pathology from Yale University and received a Certificate in Global Leadership from Tufts Fletcher School of Law and Diplomacy and a Fellowship at Harvard Kennedy School of Government. He trained in internal medicine at New England Medical Center, which awarded him the Oliver Smith Award, "recognizing excellence, compassion, and service." Dr. Theoharides has 485 publications (46,491 citations; h-index 106), placing him in the world's top 2% of most cited authors, and he was rated the worldwide expert on mast cells by Expertscape. He was inducted into the Alpha Omega Alpha National Medical Honor Society, the Rare Diseases Hall of Fame, and the World Academy of Sciences.

Website: https://www.drtheoharides.com

LinkedIn: linkedin.com/in/theoharis-theoharides-ms-phd-md-faaaai-67123735

Instagram: https://www.instagram.com/dr.theoharides/

Haylie Pomroy, Founder and CEO of The Haylie Pomroy Group, is a leading health strategist specializing in metabolism, weight loss, and integrative wellness. With over 25 years of experience, she has worked with top medical institutions and high-profile clients, developing targeted programs and supplements rooted in the "Food is Medicine" philosophy. Inspired by her own autoimmune journey, she combines expertise in nutrition, biochemistry, and patient advocacy to help others reclaim their health. She is a New York Times bestselling author of The Fast Metabolism Diet.

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