RED-S Syndrome and Undernutrition

Beyond the limit: understanding the ravages of undernutrition and RED-S on sports performance.

RED-S (Relative Energy Deficiency in Sport) syndrome is a medical condition caused by insufficient energy intake relative to the high energy expenditure associated with intense physical activity. It goes beyond simple undernutrition, affecting various systems of the body, including metabolism, hormonal system, bones, muscles and immune function. Rapid detection and treatment of RED-S is crucial to prevent potentially serious complications in athletes. Previously, we found in the scientific literature the name “athlete triad” which brought together the triptych of intensive sporting activity, amenorrhea (absence of periods for more than 3 months) and insufficient diet in relation to expenses. This syndrome is no longer just limited to women, men are also affected, particularly in endurance sports.

This article was written in partnership with Marine Lecuisiner