Anorexia nervosa is an eating disorder characterized by distorted body image and excessive weight loss. It stems from psychological factors rather than food and is an unhealthy way to cope with emotional problems. People with anorexia often equate thinness with self-worth. The disorder can have serious physical effects and is considered a mental illness influenced by biological, psychological, and sociocultural factors. Treatment involves restoring healthy eating habits, weight gain, therapy, and sometimes medication.