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Dr. Perlmutter’s groundbreaking new book, Brain Defenders, is now available for pre-order. Discover how to protect your brain and future health – reserve your copy today at
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What if your anxiety, brain fog, and burnout aren’t mental health problems, but metabolic ones?
In this episode, Dr. Robin Berzin joins Dr. David Perlmutter to make the case that the brain and body are not separate systems, and that treating them as if they are is costing millions of people their health.
Dr. Robin Berzin is a Columbia-trained internal medicine physician, founder and CEO of Parsley Health (the only national functional and longevity medicine clinic in the U.S.), and author of State Change. She has treated over 50,000 patients using a precision, root-cause approach to chronic disease and mental health.
They dig into why one night of poor sleep can push you into functional metabolic syndrome the next morning, how exercise outperforms antidepressants for many patients yet almost no doctor prescribes it, what “metabolic flexibility” is and why losing it drives hormonal chaos, and why Alzheimer’s is increasingly understood as type 3 diabetes, a metabolic disease and not just a brain disease.
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00:00 – Introduction
00:46 – Brain Defenders: A New Framework for Brain Health
03:00 – Welcoming Dr. Robin Berzin
05:23 – Why Smart, Motivated People Still Feel Terrible
08:37 – From Columbia Med to Founding Parsley Health
12:15 – The Problem With 15-Minute Appointments and Stacks of Prescriptions
14:37 – What Is Functional Medicine, Actually?
17:07 – Precision Medicine: Treating the N of One
19:45 – How AI Is Changing the Doctor’s Ability to Connect the Dots
22:41 – State Change: Shifting Your Mind Through Your Body
25:35 – Why Anxiety and Depression Start in the Body
27:09 – 40 Hz Light Therapy and Cognitive Decline
29:43 – Exercise, Sugar, and Nutrient Deficiencies as Mental Health Levers
32:30 – SSRIs as a Tow Truck, Not a Destination
34:16 – Psychedelics and Trauma: Tools in the Toolkit
36:01 – Metabolic Flexibility and Why Losing It Wrecks Your Hormones
38:04 – Sleep, Wearables, and the One Night That Breaks Your Metabolism
40:37 – Continuous Glucose Monitors as a Mirror for Your Choices
42:19 – 3X4 Genetics: Your DNA Is a Roadmap, Not a Verdict
44:37 – Alzheimer’s as Type 3 Diabetes: The Metabolic Brain Connection
46:21 – The Lab Work Your Doctor Isn’t Ordering
49:22 – Fasting Insulin, Heavy Metals, and the Tests That Actually Matter
51:14 – What’s Next: AI, Wearables, and the Future of Functional Medicine
53:56 – If You Feel Stuck: Own Your Biological Data
55:34 – Closing Thoughts
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Dr. Robin Berzin, MD is a functional medicine physician and health tech entrepreneur leading the push to bring root-cause, precision medicine into mainstream healthcare. She earned her MD at Columbia, completed internal medicine residency at Mount Sinai, and trained in functional medicine under the field’s top practitioners. Before medicine, she produced the Oprah and Friends Dr. Oz Radio Show, and she later worked in health tech during med school, sharpening her understanding of how digital platforms could expand access to personalized care.
Today, she is founder and CEO of Parsley Health, the only national functional and longevity medicine clinic in the U.S., delivering virtual care across all 50 states plus physical clinics in NYC and LA. Under her leadership, Parsley has grown to nearly 30 clinicians and 40 health coaches and nurses, treated over 50,000 patients, and built a team-based, insurance-accessible model that puts functional medicine within reach beyond the wealthy. She also sits on the medical advisory board of Whoop.
She is the author of State Change, which challenges the divide between mental and metabolic health and offers a practical framework for transforming mood, energy, and cognition through the body. Her work is widely featured across major health and wellness media, and she is recognized as a defining voice in the future of preventive, personalized medicine.
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