Metabolic psychiatry is rising, though very slowly. You do "epilepsy keto diet", and may work in bipolar/schizophrenia (need GKI 1-2, it's not keto for weight loss). But you don't need the continuous monitor, normal ketone monitor is fine, because the food list is very narrow.

The continuous monitor should help until you get the hang of the diet, it's a bit hard to maintain, but if it works, worth it.