Relative Energy Deficiency in Sport (RED-S) occurs when athletes fail to consume enough energy to meet the combined demands of training and normal physiological function, impairing health and performance in both men and women. Prolonged low energy availability can negatively affect bone health, hormone production, immune function, recovery, cardiovascular health, and mental well-being, while also increasing the risk of injury and reducing training adaptations. RED-S is best prevented by consistently matching energy and carbohydrate intake to training load, avoiding chronic under-fueling, and recognizing early warning signs before serious consequences develop. Ultimately, athletes are encouraged to prioritize adequate daily fueling and recovery, not just race-day nutrition, as the foundation for long-term performance, health, and longevity in sport.
Read more of Aaron's own words from the Carbs Fuel Website: https://carbsfuel.com/blogs/news/relative-energy-deficiency-in-sport-red-s-what-it-is-and-how-to-prevent-it