Bulimia nervosa is characterized by recurrent binge eating episodes and persistent, inappropriate compensatory behaviors with the hope of avoiding weight gain. Binge eating episodes involve eating, in a discrete period of time, an amount of food that is objectively larger than most individuals would eat in a similar period of time under similar circumstances. Such episodes of bulimia are accompanied by feelings of self-loathing, disgust, or guilt and a sense of lack of control. Individuals engage in often dangerous compensatory behaviors that may include purging, fasting, compulsive exercise, and/or the use of laxatives or diuretics. Individuals with bulimia nervosa may appear healthy, even though they are very ill. Additionally, their self-concept is unduly influenced by body weight and shape.