RED-S, or Relative Energy Deficiency in Sport, is a condition characterised by insufficient energy intake to meet the body's demands during exercise and essential daily functions like growth, respiration, and digestion.

When we underestimate the energy demands of exercise or restrict how much we consume, our bodies enter a state of ‘low energy availability’. Over time, this has the same effect as a phone in low battery mode, switching off many important but non-essential functions. Unless we fully recharge, we're putting our long-term mental and physical health at risk and shortchanging our athletic potential.

We’ve seen and experienced how easily this can happen to any athlete at any time, and we want to help you prevent or overcome this condition. Start by getting to know the signs and symptoms, and check out the FAQs below.

What causes RED‑S?

Who is at risk?

How is RED‑S identified/diagnosed?

Are weight loss and disordered eating always a factor in RED‑S?

Can males have RED‑S?

What is Hypothalamic Amenorrhea (HA) and why do menstrual cycles matter?

Does the Pill = a period?

Where can I find support?

Didn't find an answer? Head to our comprehensive Q+A pack below


Wherever possible, the information and advice offered on this site is based on the leading scientific research to date. Although the aim is to provide support and advice, this resource is no substitute for the diagnosis or treatment from a medical professional. Head here to find them.