Markedly increased appetite and eating are commonly found in seasonal
affective disorder (SAD) and bulimia nervosa (BN). To investigate dysf
unctional eating attitudes, we administered the Eating Disorders Inven
tory (EDI), a self-rating questionnaire that assesses abnormal eating
attitudes and behaviours, to 30 female SAD patients, 30 matched BN pat
ients, and 30 non-clinical subjects. The SAD patients had higher score
s on most EDI subscales compared to the non-clinical subjects; the BN
patients had higher scores than the SAD patients on only two of three
EDI subscales that are specific to eating disorders. These data add to
the evidence supporting a clinical overlap between SAD and BN.