Like the above states, an eating disorder is a mental illness that uses food as a coping mechanism. It can be a form of self-harm; an addiction. It is never a choice. You do not choose to have an eating disorder, is not a life-style or a 'diet gone wrong'. It is SO much more than that. There are also different types of eating disorders, some more common than others. They may vary in how they present themselves, but all eating disorders are equally as serious. Eating disorders can also develop into another- for example if you were originally diagnosed with binge-eating disorder, this can develop into Anorexia or Bulimia. Likewise with OSFED and other EDs.