This can involve eating too much or too little or becoming obsessed with your weight and body shape.
The most common eating disorders are:
anorexia nervosa – when you try to keep your weight as low as possible by not eating enough food, exercising too much, or both
bulimia – when you sometimes lose control and eat a lot of food in a very short amount of time (bingeing) and are then deliberately sick, or use laxatives (medicine to help you poo), restrict what you eat, or do too much exercise to try to stop yourself gaining weight
binge eating disorder (BED) – when you regularly lose control of your eating, eat large portions of food all at once until you feel uncomfortably full, and then often feel upset or guilty
other specified feeding or eating disorder (OSFED) – when your symptoms do not exactly match those of anorexia, bulimia or binge eating disorder, but it's no less serious an illness