Not really known yet: Depression is a complex problem & no one really knows the cause of any type of depression! many people get depressed in winter; it was thought to be due to lack of light but may be due to low vit d- giving d works better than light therapy! there are vit. D receptors in the brain & it may help regulate the levels of serotonin. See http://www.Vitamindcouncil.Org/health-conditions/depression/.
Answered 9/28/2016
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