There are different types of eating disorders such as, anorexia bulimia and bulimia nervosa. 

Anorexia is when a person becomes malnourished as the person typically barely eats and starves and loses weight quickly and extremely fast (KH). 

Bulimia is a combination of purging and binge eating; a person will overindulge eating food and then make himself or herself purge afterwards (KH).