Posted AT 9:56 AM EST on 12/09/08
The culprit behind the winter blues
Canadian researchers have identified seasonal changes in the brain that may help explain why some people suffer from the winter blues.Using a high-tech imaging machine, the scientists discovered that, in winter months, people have elevated levels of a protein that clears serotonin from the brain.
Serotonin is a neurotransmitter, or chemical messenger, instrumental in regulating mood, energy levels and appetite.
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