I once heard about a gentleman who beat sz through his diet. Sorry I can’t remember the name, a friend of mine told me about him one day. He ate like super healthy, did exercise, yoga etc. And snap, it worked.
Everyone’s body and mind is different though, I suppose.
As for what a calorie restricted diet does for someone with schizophrenia, I can actually tell you: it makes you a bit more tired and a bit more hungry. I’m on 1750 calories a day now.
But I wonder why when I become really anxious or stressed to the point of not being able to eat properly I have reduced symptoms for a few weeks after.