I've been following the symptom that I've named "carbonation grimace". It's an aversion to soda that is popularly known to be caused by headache medicine Topiramate.
But some people like myself are just born with it. We can't drink soda, and I've come to realize that's an indicator about our brains.
I'm running off of a theory that I've got a deficiency of glutamate/glutamine, and that this changes the way that dopamine/serotonin interact. Namely, I can only stand to have one or the other at any given time, and I've got a successful regimen that allows for that.
Also, it seems that even if carbonation grimace doesn't automatically occur in a schizophrenic patient, it WILL occur after certain simple facial exercises in those patients. In other words, I've discovered a physical test for schizophrenia.