Anorexia nervosa is an eating disorder characterized by an intense fear of gaining weight, a distorted body image, and extreme efforts to control food intake and weight. Individuals with anorexia often severely restrict their food intake, exercise excessively, and may engage in other harmful behaviors to lose weight. This disorder can have serious physical and psychological consequences, including malnutrition, organ damage, and emotional distress. Treatment typically involves a combination of therapy, nutritional counseling, and medical monitoring.