Concern about weight and appearance can become a preoccupation even for very young children. Excessive concern with body weight, body image, and food, especially when it leads children to severely restrict their food intake, vomit or use laxatives to manage food intake, or exercise to the point of causing themselves physical harm, can be both a mental health problem and a real threat to physical well-being.
A child suffering with anorexia nervosa refuses to maintain minimally normal body weight, intensely fears gaining weight, and exhibits a significant disturbance in his/her perception of the shape or size of his/her body. A child suffering from bulimia nervosa binges on food and then engages in compensatory behaviour, such as excessive exercise, vomiting, or the misuse of laxatives, diuretics, other medications, or enemas, to prevent weight gain.