You see, they see that they are actually fat and feel naturally ashamed of themselves. Anorexics, meanwhile, are not fat, but still feel ashamed as though they are fat. If you factor in the shame with the reduced intelligence that comes with being fat, their logic basically becomes ANOREXIA = FAT SHAME MY BODY = FAT SHAME THEREFORE, MY BODY = ANOREXIA Edit: Made formatting less horrifible.