Most people don't even know fully what anorexia is. I correct people all the time in conversation when they mention bulimia and anorexia in terms of purgeing (which is a common symptom of BOTH). Anorexia goes much further as it is a constant, whereas bulimia often fails because the behavior is normally episodic. Anorexia, by the time it gets to a point of hospitalization, has a very high death rate.

Anorexia: http://www.behavenet.com/capsules/di...s/anorexia.htm

Bulimia: http://www.behavenet.com/capsules/disorders/bulimia.htm