Anorexia nervosa is a psychological eating disorder that is characterized by the refusal to eat food. This lack of consumption causes a person to lose weight, which is often their desire or goal. An individual may develop anorexic behavior as a result of self harm or self punishment for the way they look or feel they are perceived. Stress and anxiety, as well as social norms and perceptions are often the basis for why individuals develop unhealthy eating habits and behaviors. Working with a professional who understands both the physical and psychological effects of anorexia is important for overcoming eating disorders.