According to a youtube video user after research this topic of chemical imbalances she found their is no evidence for chemical imbalances that it's a fad from psychiatrists who support reductionism. Go here to check it out
http://www.youtube.com/watch?v=uG8BE3ao ... annel_page
Here is a site to that is linked to the youtube video on the myth of chemical imbalances which deals with not just that topic but other maistream myths in nutrition, health and disease.
Other sites related are
Miscellaneous musings of meager merit
2 days ago