Relative Energy Deficiency in Sport (RED-S) is a syndrome that affects athletes and active individuals who do not consume enough energy (calories) to support the energy expenditure required for their daily activities, including exercise. This energy imbalance can lead to a range of physiological and psychological consequences, impacting both health and performance. See more on the RED-S page.
The diagnosis and treatment of RED-S should be carried out by an appropriate qualified healthcare professional. Therefore, if you are experiencing any negative symptoms, it is important to seek advice from your healthcare professional who is experienced in the diagnosis and treatment of RED-S.
The scientific literature shows that both sexes are affected by RED-S during sustained periods of low energy availability. However, it seems that females are more sensitive to low energy availability than males.
Anything over 45 kcal/kg FFM/day is considered to be sufficient energy availability for most people. Between 30-45 kcal/kg FFM/day is considered to be low energy availability, and anything below 30 kcal/kg FFM/day is considered to be clinically low energy availability.
This is fat free mass, which is the weight of your body that is not fat. This includes your muscles, bones, organs, and connective tissues.