This webinar with Dr. Mike T. Nelson dives deep into metabolic flexibility, the body’s ability to efficiently switch between burning fats and carbohydrates based on activity, diet, and fasting states. He explains that this adaptability is crucial for metabolic health, athletic performance, and longevity. Impaired flexibility is linked to conditions like metabolic syndrome, while improving it can enhance energy efficiency and recovery. Fuel use depends on exercise intensity: fats dominate during low-intensity activity, while carbohydrates are key during high-effort sessions. Strategic training, intermittent fasting, and tailored nutrition can shift the body’s “crossover point” to optimize fuel use.

Nelson also highlights the role of muscle mass and quality in metabolic rate and emphasizes personalized approaches using technologies like indirect calorimetry and muscle oxygen sensors. Tools like these can help individuals tailor their training and nutrition for better fat oxidation, performance, and recovery. Practical strategies include fasted morning walks, targeted carb timing, resistance training, and gradual fasting protocols. Ultimately, Nelson encourages a data-informed, iterative approach: combining science, self-assessment, and consistent action to build sustainable metabolic health.

This BSI Medical Society Webinar was streamed on May 14th, 2025.

A 10-minute summary of the webinar is available here free, for anyone, while the full webinar is available for Medical Society Members and MetFix affiliates in their dashboard.