What is the scientific term when people starve themselves to become excessively stay thin?

The scientific term for when people starve themselves to become excessively stay thin is anorexia nervosa. Anorexia nervosa is an eating disorder characterized by an intense fear of gaining weight, an unhealthy desire to be thin, and a disturbance in the way a person perceives their body. People with anorexia nervosa often have a distorted view of their body, and may see themselves as overweight even when they are dangerously underweight. This can lead to severe malnutrition, dehydration, and a range of other health problems. Anorexia nervosa is a serious mental illness that requires professional treatment.