Behav Med
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Research on psychiatric disorders in obesity has indicated that obese people are not psychiatrically different from nonobese people. Few studies, however, have addressed the potential impact of psychopathology on weight control. ⋯ After 12 weeks of a liquid protein formula diet, patients with no personality disorder lost significantly more weight than personality disordered patients; personality disordered patients on a behavioral diet tended (p < .15) to lose more weight during a 12-week diet than the patients without personality disorders. These data suggest that there are differential responses to liquid protein and behavioral diets, depending on the presence or absence of a personality disorder.