Eating disorders come in various forms. Their presentations range from the emaciated individual with anorexia nervosa, to the person with bulimia nervosa who eats large amount of food ("binge eat") only to throw those up, to individuals with binge eating disorder, and there are also many in-between states of disordered eating.

For most, the existence of eating disorders is difficult to understand, because isn't eating the most natural thing of the world? And it is true that eating disorders, at least on first sight, have little rational explanation to them.

This book...