Anorexia is an eating disorder characterized by an intense fear of gaining weight and refusal to eat, which causes dramatic weight loss. People with anorexia restrict their food intake and excessively exercise in an attempt to lose weight. While a physical condition, anorexia also stems from psychological factors like low self-esteem, perfectionism, and a desire to control weight. Treatment focuses on psychotherapy, nutrition counseling, and sometimes medication to address the emotional and physical aspects of this serious condition.