Several of the chapters in this section, specifically those on ketones and their discovery and medical implications, may appear to some readers as too biochemical or technical. If you do not have a scientific or medical background, then you may want to revisit these chapters after you read Part Three of the book or you may choose to skip them entirely. This information is not essential to using this dietary intervention. The nature of the brain, Alzheimer’s disease, ketones, fatty acids, and the like, although extraordinarily interesting, are indeed technical. For those readers who are eager to know the science behind the discovery, the information in Chapters 14–19 is a primer introducing you to ketones.