"Conclusions: Our results demonstrate that psychotic disorders with greater cognitive impairment have greater brain metabolic dysregulation, with more reductive stress and decrease in energy metabolic rate markers. This provides new evidence for the potential of emerging metabolic therapies to treat cognitive deficits in psychotic disorders."
What this means is that metabolic interventions like ketogenic diet that improve brain metabolic function may be helpful in cognition for patients with psychotic illness. Or, in lay terms, "with better fuel for the brain, people with the most serious mental illnesses may be able to think better."
https://academic.oup.com/schizophreniabulletin/advance-article-abstract/doi/10.1093/schbul/sbaf003/7984396?redirectedFrom=fulltext&login=false