What is Relative Energy Deficiency in Sport (RED-S)?

RED-S refers to health and performance problems that can occur when an athlete’s energy intake is insufficient in relation to the energy required by training and normal physiological functions.

It can affect multiple aspects of health and performance.

Importantly, RED-S is not simply a “low-weight” condition.

The IOC recommends a comprehensive approach to assessment and emphasizes decisions based on the principle:

Health first — performance second.

This principle is particularly relevant when working with young dancers.

Last updated September 22, 2026