The Truth About GLP-1s

GLP-1 medications like semaglutide and tirzepatide are everywhere right now—but are they actually solving the problem? In Episode 8 of this 16-part series on ultra-processed foods, Dr. Brendan McCarthy breaks down the truth about GLP-1 medications: how they work, why they can feel like a “miracle,” and where things go wrong when they’re used without proper medical guidance. This isn’t about shame. It’s about understanding. GLP-1s can quiet “food noise” and help regulate appetite—but they don’t fix your relationship with food, your metabolism, or the long-term patterns that lead to weight gain. Without structure, nutrition, and proper care, many patients end up with muscle loss, nutrient deficiencies, and rebound weight gain. In this episode, you’ll learn: What GLP-1 medications actually do in your body Why they’re not a long-term solution on their own The biggest mistakes doctors and clinics make when prescribing them How ultra-processed foods drive weight gain in the first place How to use GLP-1s the right way to create lasting change The goal isn’t dependence—it’s freedom. If you’re currently on a GLP-1 (or considering it), this episode will change how you think about your treatment plan.   Mechanism Anchored References This episode is not anti medication. It is about putting GLP 1 therapy in its proper place. GLP 1 receptor agonists can reduce appetite pressure and alter satiety signaling. That matters. But quieter appetite is not the same as full recovery. Food quality still matters. Protein still matters. Muscle still matters. Structure still matters.   References U.S. Food and Drug Administration. WEGOVY semaglutide injection Prescribing Information. 2025. Wilding, John P H, et al. Once Weekly Semaglutide in Adults with Overweight or Obesity. New England Journal of Medicine, vol. 384, no. 11, 2021, pp. 989 to 1002. Wilding, John P H, et al. Weight Regain and Cardiometabolic Effects After Withdrawal of Semaglutide The STEP 1 Trial Extension. Diabetes Obesity and Metabolism, vol. 24, no. 8, 2022, pp. 1553 to 1564. Hall, Kevin D, et al. Ultra Processed Diets Cause Excess Calorie Intake and Weight Gain An Inpatient Randomized Controlled Trial of Ad Libitum Food Intake. Cell Metabolism, vol. 30, no. 1, 2019, pp. 67 to 77. Neeland, Ian J, et al. Changes in Lean Body Mass with Glucagon Like Peptide 1 Based Therapies and Mitigation Strategies. Diabetes Obesity and Metabolism, 2024. Wilding, John P H, et al. Impact of Semaglutide on Body Composition in Adults with Overweight or Obesity Exploratory Analysis of the STEP 1 Study. 2021. Everitt, Barry J, and Trevor W Robbins. Drug Addiction Updating Actions to Habits to Compulsions Ten Years On. Annual Review of Psychology, vol. 67, 2016, pp. 23 to 50. Monteiro, Carlos A, et al. The UN Decade of Nutrition the NOVA Food Classification and the Trouble with Ultra Processing. Public Health Nutrition, vol. 21, no. 1, 2018, pp. 5 to 17.   Dr. Brendan McCarthy is the founder and Chief Medical Officer of Protea Medical Center in Arizona. With over two decades of experience, he’s helped thousands of patients navigate hormonal imbalances using bioidentical HRT, nutrition, and root-cause medicine. He’s also taught and mentored other physicians on integrative approaches to hormone therapy, weight loss, fertility, and more. If you’re ready to take your health seriously, this podcast is a great place to start.   👇 Tap Subscribe to learn more about what’s actually happening in your body, and what to do about it.   📘 Read Dr. McCarthy’s Book: Jump Off the Mood Swing – A Sane Woman’s Guide to Her Crazy Hormones https://www.amazon.com/Jump-Off-Mood-Swing-Hormones/dp/0999649604   📲 Follow Dr. McCarthy: Instagram: @drbrendanmccarthy TikTok: @drbrendanmccarthy Website: www.protealife.com   💬 Got a question or topic for a future episode? Let us know in the comments!