Eating disorders are ' eating ' disorders, they are the symptom that something is wrong in the personality ( anxiety, depression, neurosis etc..). However someone who has a eating disorder ( bulimia / anorexia) can have an exercise addiction at the same time.
Eating disorders / addictions can be fixed with a Psychoanalyst. By letting this person talk like he(r) want to, he / her will help to understand why the person has these symptoms and thus, that could be cured.
Have a nice day
Catherine ( experience )
Ps : exercise addiction is a symptom as well ...