Obsession or illness?

Anorexia:This is an illness that causes serious disturbances to your everyday diet. Such as eating extremely small amounts.  A person with an eating disorder may have started out just eating smaller, and then thy don't eat completely. There are some diferentes illness, for  example anorexia or bulimia.  This illness affect both men and women,  frequently appear during the teen years or young adulthood but may also develop during childhood or later in life.