It is surprising how we (in general) mindlessly believe that depression (and other mental-health conditions including anxiety) are purely a chemical imbalance in the brain and that it does not have environmental/social factors.
""It is a bio-psychosocial problem; there are biological factors and psychological and social factors. What Hari is talking about are the social drivers of depression.""It's good to challenge how the drug companies and the DSM and the FDA oversimplify not just depression, but all mental disorders,"
Professor McGorry said. "They try to reduce them and American psychiatry is really responsible for that; they turned away from psychoanalysis to biological psychiatry and regarded everything as just a brain disease.""
http://www.abc.net.au/news/health/2018-02-21/depression-serotonin-or-society-to-blame/9461590?licu=urn:li:control:d_flagship3_profile_view_base_recent_activity_details_shares-object