Can excessive suppository use be a symptom of an eating disorder?

Eating DO: Yes, possible, especially if not medically indicated, as well as use of laxatives.

Absolutely : Individuals with eating disorders will take drastic measures in order to lose weight. Suppositories can be used as cathartics which may cause near immediate weight loss. Other means of weight loss include use of diuretics (water pills), purging after eating, and intake restriction. Look for other signs and symptoms before rendering an opinion. There are other causes of chronic suppository use.

Suppository: Yes, as noted above. Others can be excess use of laxatives, fluid pills, etc.