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«Depression could be evolutionary byproduct of immune system» - http://medicalxpress.com/news/2012-03-depression-evolutionary...
«authors propose that evolution and genetics have bound together depressive symptoms and physiological responses that were selected on the basis of reducing mortality from infection. Fever, fatigue/inactivity, social avoidance and anorexia can all be seen as adaptive behaviors in light of the need to contain infection» ‎- 9000