Which condition is described as an eating disorder with a false perception of body appearance?

Anorexia nervosa is an eating disorder characterized by an intense fear of gaining weight and a distorted body image, which leads individuals to restrict their food intake severely. Those affected may perceive themselves as overweight, even when they are underweight or at a healthy weight. This false perception drives their behavior, resulting in extreme dieting, excessive exercise, and other harmful practices to lose weight. Anorexia nervosa can have severe physical and psychological consequences, making it a critical condition to recognize and address.

The other conditions listed do not relate to body image or eating disorders. Cholecystitis refers to inflammation of the gallbladder, valvulitis is inflammation of a heart valve, and diuresis is the increased production of urine, none of which involves a false perception of one's body appearance or an eating disorder. This distinction further highlights why anorexia nervosa is the fitting choice for this question.