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Its called Seasonal Affective Disorder - SAD for short - and it has to do with the lack of sunlight received by the body during the winter months. That, in turn, is a result of the depletion of vitamin D that is produced when a person is exposed to less sunlight than a minimum required.

Its actually a pretty complex process within the human body that produces and changes chemicals; nonetheless, the shortened daylight hours contribute to the condition.

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16y ago

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