I couldn't rate this book. It's well written, and the brain energy theory sounds plausible. I am skeptical of some of the solutions to mental illness, particularly the ketogenic diet. I can't speak to its efficacy until I've tried it. The book describes the theory in scientific terms involving mitochondria and the metabolic system. It's is fascinating, and parts are over my uneducated head. I will have to do my own research. I have a project now!