Anorexia nervosa is an eating disorder in which people have an intense fear of gaining weight and can become dangerously thin. Signs of anorexia include less than normal weight, negative body image, and obsession with food.
Keep in mind that severe Weight loss makes a person unable to think clearly or function well in daily life. This is a sign that a loved one needs medical care.
Maitaining a Balanced life is the only way of preventing Anorexia nervosa.