Final answer:
Anorexia is the condition in which a person experiences a loss of appetite. It is a psychological disorder characterized by extreme fear of gaining weight and a distorted body image.
Step-by-step explanation:
A condition in which a person experiences a loss of appetite is called anorexia. Anorexia is a psychological disorder characterized by an extreme fear of gaining weight and a distorted body image. People with anorexia often restrict their food intake severely, leading to significant weight loss and malnutrition.