She has a good point. I have depression and have had for years. I have been told various things about the depression. It is physical, my body doesn't produce enough Seritonin, it is an emotional illness, low levels of vitamin D in the body has been connected to depression and even that my genetics may have made me suseptible.)
The truth is they really don't know what causes most mental health disorders. (for instance in a family group where there are 4 kids and at least one parent with schizophrenia, not all the kids will have schizophrenia. Maybe none of them will.) They can say they believe there may be a genetic connection, but they can't truly say for sure.
This topic can be debated and debated with little resolution. There is a psychiatrist, Thomas Szasz, who believed that many mental illnesses are neither mental nor illness but problem coping behaviors. He believed many illnesses labeled as mental disease were poor ways of dealing with life. So people may act out with hostility or depression instead of just dealing with their problems. The basis of his ideas were that it was still behavior not disease. Looking at it as disease takes the reponsibility of the behavior off the individual and gave the medical community license to create a social definition of normal according to Szasz.
http://www.szasz.com/manifesto.html
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