Nutrition
Relative Energy Deficiency in Sport
Relative energy deficiency in sport is under-fueling versus training that harms hormones, bones, and performance—treat energy availability before adding load.
Relative energy deficiency in sport (RED-S) is chronic under-fueling relative to training—impairing hormones, bone health, mood, and performance even without clinical eating disorders. Warning signs include missed periods, stress fractures, flat HRV, and stalled strength.
Fix energy availability before adding volume.
Common questions
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Can you have RED-S without an eating disorder?
Yes—accidental under-fueling from busy schedules or aggressive deficits counts. Raise calories, reduce load, and involve clinicians if menstrual or bone symptoms appear.
Related terms
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