Anorexia is a disease that can make you gain weight very slowly. It causes you to have less energy. In the beginning, you may only eat very little food. As the time goes by, your appetite may increase. You may want to have a special diet. Your weight loss may be very slow. Sometimes you may feel weak and faint. Anorexics usually have a low self- esteem. They may think that they are very ugly. Some people who have anorexia are very thin and they have dark circles under their eyes. They may be afraid to eat anything that is good for them. They may think that they are too fat and may want to be thinner.