Ketones, The Fourth Fuel
A very tough, but really, really good read. The first 2/3rds of this book may as well be a chemistry text-book. Essentially an overview of cumulative scientific understanding of the human metabolism over the last several hundred years, few compromises are made when discussing the details of the reactions, molecules, and individual atoms between. Not being a chemist or biologist, some of that was a little tricky to follow. But as an engineer, the machinery makes sense! This book opens up a fascinating door of what our bodies are capable of and what many think they ought to be doing, were it not for the modern American diet.