The relationship of affective state to dietary preference: winter depression and light therapy as a model.

Seasonal affective disorder (SAD) patients often crave carbohydrates when depressed during the winter. We measured dietary intake using a daily Food/Drink Frequency Questionnaire in 36 SAD patients over four conditions: when depressed in winter, during light therapy (1 h 2500 lux, morning or evening), during withdrawal, and when euthymic in summer. Carbohydrate intake (both sweet and starch) in the second half of the day was elevated during winter depression and was as low after light therapy as in summer. The medial hypothalamus is hypothesised to play a key role in coupling 'mood and food' in SAD.