105 : The Insulin Resistance Lie? What Actually Causes Type 2 Diabetes | Dr. John Poothullil

For over 20 years, Dr. John Poothullil has challenged one of the most widely accepted doctrines in modern medicine: the idea that Type 2 diabetes is driven by "insulin resistance." Dr. John is a retired physician, author, and researcher whose career has spanned internal medicine, endocrinology, hunger physiology, and cancer prevention. After witnessing firsthand the devastating complications of standard diabetes care in his own family and clinical practice, he embarked on a decades-long journey to re-examine the core mechanics of metabolic health. In this conversation, we explore a provocative question: with over 50 hormones and 200 distinct cell types in the human body, why would only three specific cells become "rebels" against insulin? Dr. John breaks down why Type 2 diabetes is not an issue of cellular resistance, but rather a problem of substrate oversupply triggered by modern agricultural shifts, hyper-processed carbohydrates, and lost biological signaling. Those insights reveal how the natural instincts we all had as toddlers—chewing, flavor detection, and intrinsic satiety cues—can be reclaimed to reverse metabolic dysfunction, rethink drugs like GLP-1s, and rebuild our relationship with food from the inside out. Timestamp: 00:00 Podcast Intro 01:33 Meet Dr. John Poothullil 04:00 How Insulin Actually Works: The Doorbell Analogy 06:40 Why Endocrinologists Blame the Cell 08:08 The Body as a Hybrid Engine: Fuel Selection 09:50 Why Would Only 3 Cells Pick on Insulin? 12:35 How Type 1 and Type 2 Diabetes Got Confused 16:15 Medical Codes, Subscriptions & Treating Symptoms 20:40 Writing to the NIH: Challenging the Dogma 25:10 Why Lowering Blood Sugar Doesn't Stop Complications 28:15 The Agricultural Revolution & Grain-Based Diets 31:50 Undersupply vs. Oversupply 32:44 Fat Cells, Triglycerides & Fuel Switching 37:35 What Toddlers Know About Eating That Adults Forget 40:35 The Trap of Ultra-Processed Carbohydrates 46:00 The Real Reason GLP-1 Drugs Help People Lose Weight 55:30 Natural Sugar, Chewing & Dopamine 1:00:00 Why Nature Designed Food to Be Chewed 1:02:15 Retraining Your Control Center 1:07:20 The Solution Is Behavioral, Not Another Prescription 1:14:00 Cosmetic Obesity vs. Medical Obesity 1:18:20 What Healthy Eating Actually Looks Like 1:20:30 Final Thoughts & How to Learn More Learn more about Dr. John and his work: https://drjohnonhealth.com/ Want To Know More About Zach. If you’re new to the show and haven’t heard his incredible story, go back and listen to the show’s trailer, or visit Zach’s website zachtidwell.com, where you can also reach out to have him speak at your company or event. To get the big news when his book going to print, join his email list on the website. Follow And Support The Show Follow, rate, and review the show wherever you listen. And if that happens to be on YouTube, like this video too before sharing the episode with family and friends. Website: zachtidwell.com #GIB #GoingInBlind #Type2Diabetes #InsulinResistance #MetabolicHealth #Nutrition #GLP1 #HealthAndWellness