Vitamin D Deficiency and Seasonal Affective Disorder. . . and the Light at the End of the Tunnel
Somewhere in the ballpark of 10 million Americans suffer from Seasonal Affective Disorder (S.A.D.), also commonly called winter blues. Those who experience S.A.D. are. . . well. . . sad. And you can paint the sadness on a spectrum — from mild malaise to severe depression. For those who live north of a virtual line going from DC to San Jose, winter blues is a real thing.