Most triathletes understand that training is the stimulus for improvement — but without proper fueling, the body can’t adapt. In this episode, we break down the critical role that calories, carbohydrates, protein, and fat play in driving endurance adaptations at the cellular level.

We dive into how under-fueling sabotages progress by impairing mitochondrial biogenesis, hormone balance, and recovery, and we explore why carbs aren’t just fuel — they’re also powerful anti-catabolic agents. You'll learn that protein supports structural remodeling, that fat drives hormone health, and why energy availability is the foundation of performance.