Seasonality of symptoms in anorexia and bulimia nervosa.

The bulimia nervosa group had higher global seasonality scores than the anorexia nervosa and nonclinical groups.

• A significant proportion of bulimia nervosa patients showed presumptive diagnoses of seasonal affective disorder.
• Anorexia nervosa patients did not exhibit differences in seasonality scores compared to nonclinical subjects.
• Thirty-two percent of patients with seasonal bulimia nervosa did not experience simultaneous worsening of mood and eating symptoms.
• Findings indicate that seasonality of symptoms may be specific to bulimia nervosa.

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