Fitness
Relative Energy Deficiency in Sport
RED-S is under-fueling relative to training load, harming performance and health. Adequate calories, rest, and medical care—not more volume—restore balance.
Relative energy deficiency in sport (RED-S) occurs when training demand exceeds fueling—hurting performance, bone health, hormones, and immunity in athletes of any sex. It is broader than the old female athlete triad label.
Restoration needs adequate calories, protein, rest, and often medical support—not more volume.
Common questions
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Can men get RED-S?
Yes—any athlete with chronic energy mismatch is at risk. Look for performance decline, frequent illness, stress fractures, and low libido alongside under-eating patterns.
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How is RED-S different from a normal deficit?
A planned short deficit for fat loss still includes adequate protein and recovery. RED-S is sustained mismatch with health and performance consequences—fix fuel and load, not willpower.
Related terms
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