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Hello my name is Doctor Hansen with Depression-symptoms.org.
What you need to know about Seasonal depression,
It has been argued that S.A.D is an evolved adaptation in humans that is a remnant of
a hibernation response in some remote ancestor. Presumably, food was scarce during most of
human prehistory, and a tendency toward low mood during the winter months would have been
adaptive by reducing the need for calorie intake. It is suggested that the response
may also somehow regulate reproduction in females.
Visit depression-symptoms.org or click the link in the description
for more information.