This case study on 2 people is easy to read.
It’s interesting because Dr. Perlmutter has observed such cases in his own practice that have improved after the low carb, gluten free, keto diet.
You can access the case studies at the link above. But the abstract written by the principles is below:
We report the unexpected resolutionof longstanding schizophrenic symptoms after starting a low-carbohydrate, ketogenic diet. Aftera review of the literature, possible reasons for this include themetabolic consequences from theelimination of gluten from thediet, and the modulation of thedisease of schizophreniaat the cellular level.