If you have anorexia, what are your chances of becoming infertile?

Depends. The severity of the disease indicate the severity of the larger physiological consequences.
Chances Are Good. Depending on the amount of body fat a woman has lost, anorexia nervosa is associated with infertility. Hormones, necessary for normal functioning of the female repoductive system, are partially manufactured in fat cells. No fat= no hormones. Eating disorders can be deadly, with a 25% mortality rate if untreated..!