Final answer:
Anorexia nervosa is characterized by a preoccupation with food, body weight, and shape that can lead to extreme dieting, even starvation, to lose weight.
Step-by-step explanation:
Anorexia nervosa is characterized by a preoccupation with food, body weight, and shape that can lead to extreme dieting, even starvation, to lose weight. People with anorexia nervosa have a distorted body image and often view themselves as overweight, despite being underweight. This eating disorder is caused by a complex mixture of biological, behavioral, psychological, and social factors.