Depression as an adaptation?
For anyone who has been depressed, it is difficult to conceive of depression as something ever useful. Depression immobilizes people, and the core symptom is anhedonia, the inability to feel pleasure. From the perspective of depressed people, these add up to a living hell. The World Health Organization estimates that depression is the fourth leading cause of disability in the world, and that it is projected to become the second leading cause of disability. I recently finished watching a "Great Courses" video lecture series called "Stress and Your Body," featuring Robert Sapolsky, who described the strong correlation between stress and depression. He indicated that lack of outlets, lack of social support and the perception that things are worsening are precursors to depression. In an article titled "Is Depression an Adaptation?" psychiatrist Randolf Nesse terms depression "one of humanity’s most serious medial problems." Nesse also argues, however, that many instances of depression are actually adaptive. How could this possibly be? Nesse explains: [More . . . ]