It is hazardous making personality disorder diagnoses among those with eating disorders. This is because eating disorders have their onset in adolescence and they directly affect many of the characteristics upon which personality is judged. Thus there is a risk of overestimating the presence of personality disturbance. Nevertheless, some patients with bulimia nervosa do seem to have a coexisting personality disorder, the most common form being borderline personality disorder. (19 Little is known about the rate of personality disturbance among the relatives of these patients.
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