Female Athlete Performance & RED-S / Female Athlete Triad

RED-S (Relative Energy Deficiency in Sport) and the Female Athlete Triad describe what happens when an athlete’s energy intake doesn’t match training demands over time — with effects that reach far beyond the scale. H2O Nutrition specializes in this area, helping female athletes restore energy balance, menstrual function, and bone health while continuing to train and compete.

What Is RED-S / The Female Athlete Triad?

The Female Athlete Triad refers to the interrelationship between low energy availability, menstrual dysfunction, and low bone mineral density. RED-S is a broader model that captures the same underlying cause — chronic underfueling relative to training demand — and its wider effects on metabolic rate, immune function, cardiovascular health, and performance, in both female and male athletes.

Common Warning Signs

Missed or irregular periods, or periods that stopped altogether
Frequent stress fractures or bone injuries
Plateauing or declining performance despite consistent, hard training
Persistent fatigue not explained by training load alone
Frequent illness or slow recovery from minor injuries
Preoccupation with food, weight, or body image that’s affecting daily life

What Treatment Looks Like

Energy availability assessment — understanding the gap between intake and training/activity demands
Structured refeeding strategy — gradually restoring adequate intake in a way that’s sustainable and doesn’t trigger anxiety around eating
Collaboration with your medical team — working alongside physicians, sports medicine providers, and mental health professionals as needed
Return-to-training guidance — supporting a safe path back to full training as energy availability improves
Long-term monitoring — ongoing support to prevent relapse once energy balance is restored

Who This Is For

Female athletes with menstrual irregularities related to training and eating patterns
Athletes with recurrent stress fractures or unexplained performance plateaus
Endurance, aesthetic, and weight-class-sport athletes, who face elevated risk
Coaches, parents, or teammates who suspect an athlete may be dealing with RED-S

A Note on This Work

This content is educational and does not replace individualized medical care. If you or someone you know is showing signs of RED-S or the Female Athlete Triad, please also involve a physician — this is a condition best managed with a full care team.