Anorexia is a disease which comes from an eating disorder. It is actually the lack of eating. It can be quite dangerous as many have died due to this problem. It can be caused by a number of things but one of the most common causes is a female who becomes too obsessed with her body and her weight therefore she stops eating. This can actually allow the disease to take hold and tell her things such as that she is fat when she weighs only 80 pounds or so. The disease is lying.
Another thing that often happens is that the subject becomes unable to eat. They are not hungry because their body is shuttiing down. Sometimes they are intersected by someone who cares and they are force fed or fed intervenously. They are the lucky ones. Those who don't often die unless they seek treatment. This disorder is very serious and must be treateed, mentally and physically as well.