Why Some Get SAD

Why Some Get SAD

Seasonal affective disorder, or SAD, is a form of depression most often experienced in winter, when exposure to sunlight is limited. Although the mechanism of the disorder is not entirely understood, researchers are closing in on its causes. Data show that people with SAD have higher evening and nighttime levels of serotonin transporter (SERT) protein during the winter months than do healthy volunteers. SERT carries serotonin, a neurotransmitter that helps regulate mood, back into nerve cells where it is not active, so these higher SERT levels could conceivably account for the “winter blues.” More… Discuss

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