The problem seems to be that we don't really understand enough about how to brain works and how these medication work with the brain. So many psych meds are like "we don't really know how this works, but we think it might do this".
I think that's why there so much trial and error with psych meds. Plus don't get me wrong, the wrong med can be devastating to certain people. I ended up in the ER a during my trials due to bad reactions.
I still try to exercise and watch my diet. I don't have any studies or anything but low carb seems to keep me more mentally stable.