Very often mainstream science is drawing the wrong conclusions about its findings, the fact that it appears to be a chemical imbalance because it can exist in people with certain mental illnesses doesn't mean its caused by that, it could be the other way around, however large pharma has a lot to lose by it being found to be this way so this idea is propagated.
Interesting post :-)
Thought you may be interested in mine about mental health equality!
I have followed and uprated, please take a look :-)
https://steemit.com/life/@georgemason/demand-mental-health-equality-now