There is a huge amount of information in this book. You really do need to read the whole book first to get a good over-view of how the body works and responds to food and outside influences. At the end of each chapter is a summery. I have read a lot of diet books but this one explains the body's mechanisims better than all of them. To loose weight and feel healthy you need to understand your body – to do that, you need to read this one chapter at a time. It gives great insight to better health across the board. There are a lot of things that are explained in here, that other books don't even touch. A very good read, although sometimes a little repeative and long-winded. Bare with it, it will be worth it!