The Flex Diet: A Science-Based Guide to Metabolic Flexibility

·1 hr 11 min·5 clips

Mike Nelson identifies the four tightly regulated survival systems—temperature, pH, blood glucose, and oxygen—that underpin physiologic flexibility.

Host Christopher Kelly introduces returning guest Dr. Mike T. Nelson, an exercise physiologist and adjunct professor. The episode begins with casual conversation about lockdown life and a detailed, harrowing story from Nelson about a kiteboarding accident in Hood River. The interview then shifts to professional topics, starting with an update on Nelson's use of cannabidiol (CBD) with clients, noting its hit-or-miss efficacy, especially for sleep and anxiety. A significant portion is dedicated to heart rate variability (HRV), where Nelson acknowledges its poor predictive value for acute strength performance but defends its utility for monitoring long-term physiological stress and unconscious stressors like marital arguments. He discusses using devices like the Oura ring for sleep and temperature tracking, emphasizing individual trends over absolute accuracy. The core of the episode focuses on Nelson's new product, the Flex Diet Certification. He explains it was created to solve gym nutrition chaos by providing a systematic, semi-customizable framework that starts with foundational elements like protein intake. Nelson details the marketplace response, noting most buyers are individual trainers or fitness enthusiasts, not large gyms. He shares his philosophy against fear-based marketing in the fitness industry. The conversation delves deep into Nelson's concept of 'physiologic flexibility,' which he defines as training the body's four tightly regulated survival systems: temperature, pH, blood glucose, and oxygen/CO2. He links this to practices like sauna, cold exposure, and Wim Hof breathing. Nelson introduces the 'Pop Tart Test' as a provocative, real-world assessment of carbohydrate tolerance and metabolic flexibility. The discussion covers practical modalities like blood flow restriction (BFR) training and the potential (and limitations) of supplements like beta-alanine and sodium bicarbonate for buffering acidity. Nelson mentions his Flex Diet podcast and his one-on-one client work, which often involves trainers using themselves as case studies. The episode concludes with information on how to find Nelson's work and a hope to meet at future events like the Ancestral Health Symposium.

As heard by us

A clear, candid look at metabolic flexibility, certification, and the audience a serious course is built to serve.

Metabolic flexibility comes through as both a training idea and a course-design question: why Mike T. Nelson built the eight-week Flex Diet Certification, and who it is meant to serve.

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Why you'd press play

Want a candid look at Mike T. Nelson's Flex Diet Certification, who it serves, and why he built it as a certification instead of another continuing-education product?

Read the full recommendation in PlayNext →

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