Sigh...
Anorexia Nervosa - National Association of Anorexia Nervosa and Associated Disorders
"3. Body Image Problems
When a person with anorexia looks into a mirror he/she does not often see an accurate reflection. A person with anorexia sees him/herself as fat, even if he/she is dangerously thin. This is a very frightening experience and feels very real – driving the person to diet"
Doesnt matter if they are dangerously thin or not. They see themselves as overweight.
However I did learn something about anorexia from this link.
"Sometimes a person with anorexia can accept that he/she is very thin but cannot accept how dangerous the situation really is. It is difficult for him/her to understand that a very low weight and dangerous dieting habits can actually be fatal."
Some anorexics understand they are skinny but cant accept how dangerously thin they are. However you still cannot alleviate anorexia by preforming liposuction on them since anorexia is still the intense fear of gaining weight and even if they are extremely skinny they will fear gaining weight again.