The term eating disorder covers a broad range of disorders that usually restricts the amount of nourishment a person receives. Anorexia and bulimia are the most well known but there are many more sub-types. Eating disorders are dangerous because a person can quickly become malnourished, experience bone loss, organ tissue damage, and even death. Most people with eating disorders are very secretive about their condition, so it is important to monitor a person closely if they suddenly begin to lose large amounts of weight.