Chris Palmer, Harvard Psychiatrist has written a book called "Brain Energy" about the potential effects of Ketogenic therapy. The crux of his theory relies on Mitochondria's health which play essential roles (serotonine dopamine regulation, epigenitic signaling...) apparently a lot more than just providing ATP. And you have millions of them in each neurone so trauma, addiction, chronic stress, malnutrition, brain insulin resistance... may have compromised those organelles and the neurones therefore become over or under excitable. Ketones provide a relief for Mitochondria (only alternate energy source for the brain, mitophagy of damaged cells, protection of healthy ones through uncoupling). It is a lot more than just basic common sense for good health - although getting all the essentials nutriments may be part of it as well !

Anyway in his book (or podcasts) there are many anecdotal but nevertheless fascinating cases of hopeless patients in total remission after a couple of months on keto therapy. It seems a lot of research is underway as well