# Athletes From Every Sport Are Talking About RED-S. Is Workout Hustle Culture to Blame?
Relative Energy Deficiency in Sport (RED-S) has moved from the margins of sports medicine into mainstream conversation. Athletes across running, gymnastics, swimming, cycling, and team sports now openly discuss the condition. Experts describe RED-S as a dangerous metabolic state triggered when calorie intake fails to match energy expenditure during training.
The mechanism is straightforward. When athletes consume fewer calories than they burn during workouts, their bodies enter a state of chronic energy deficit. This deficit cascades through multiple physiological systems. Bone density decreases. Hormone production drops. Immune function deteriorates. Heart rate variability declines. Performance suffers, paradoxically, despite the athlete's attempt to gain an edge through restriction.
RED-S differs from the eating disorders it often accompanies. A person can have RED-S without a formal eating disorder diagnosis, though the two frequently overlap. The condition affects both male and female athletes, though research historically focused on female athletes in aesthetic sports like gymnastics, figure skating, and distance running. Male athletes in sports that emphasize leanness, including distance running and rowing, now report RED-S symptoms at higher rates.
The culture of training intensity and body optimization has amplified the condition's prevalence. Social media showcases athletes grinding through workouts while maintaining extreme leanness. This narrative conflates sacrifice with results. Athletes internalize the message that more training plus less food equals success. The International Olympic Committee published guidelines on RED-S in 2018, recognizing the epidemic within elite sports, yet the condition remains underdiagnosed in recreational and collegiate athletes.
Warning signs include persistent fatigue despite adequate sleep, declining performance metrics, frequent illness, irregular menstrual cycles in female athletes, low bone density, stress fractures, elevated resting heart rate, and obsessive food tracking. A single stress fracture in a young athlete without obvious trauma should trigger RED-S screening.
Sports medicine physicians now screen for RED-S using metrics beyond body composition. The Relative Energy Deficiency in Sport questionnaire asks about training volume, calorie restriction, gastrointestinal symptoms, and mood changes. Blood work measures hormones including leptin, testosterone, and thyroid function. DEXA scans assess bone mineral density in symptomatic athletes.
Treatment requires multidisciplinary teams. Registered Dietitian Sports Nutritionists calculate adequate energy availability, typically 45 kilocalories per kilogram of fat-free mass per day for athletes in heavy training. Mental health support addresses the psychological components driving restriction. Coaches must modify training intensity during recovery periods. Return to full training takes months, not weeks.
The challenge lies in culture shift. Athletes fear that addressing RED-S means losing competitive edge. Coaches sometimes minimize symptoms. Parents and training partners inadvertently reinforce restrictive behaviors through praise of leanness.
Medical organizations including the American Academy of Pediatrics now recommend RED-S screening during sports physicals. Early identification prevents progression to severe bone loss, metabolic damage, and compromised performance. The evidence is clear: energy availability is not a detail to optimize after performance gains are maximized. It is foundational to athletic health and sustained performance.