RED-S / Energy Availability In short: RED-S — Relative Energy Deficiency in Sport — is what happens when your body isn't getting enough fuel to cover both training and basic physiological function. It quietly scales back hormones, bone density, immune function, and tissue repair. RED-S symptoms often look like bad luck: a stress fracture that won't heal, recurring injuries, fatigue that doesn't fit your training load. They aren't. They're your body making hard choices. Most people who come to me…