When a patient has an active eating disorder, it is generally ineffective to use exercise or sports as an “incentive” to get him to eat more or gain weight. Even the patient who absolutely loves soccer, and says he would do anything to keep playing, probably won’t be able to eat enough to make that happen. The malnourished anorexic brain is just not capable of overriding symptoms, no matter how alluring the reward may be.
For people with eating disorders, exercise poses numerous medical risks including stress fractures, osteoporosis, muscle wasting, and heart arrhythmia. Further, exercise can be counterproductive to treatment goals when a patient needs to restore weight. For these reasons, I recommend that patients with Anorexia Nervosa or Bulimia Nervosa abstain from all physical activity until they meet the following criteria: