I've lost 30 pounds on the Zone Diet so I know it works, and it's not complicated to follow. Although I'm very familiar with the principles of the plan, I find this book a useful and inspirational addition to my low carb diet book collection.
I followed the Zone diet a few years ago and lost 30 pounds with not too much effort. I recommend that you read his original book "The Zone" or "Mastering the Zone" (not as good) rather than relying on this book alone. It's a sensible diet that works. While you can make a hormonally correct meal with ham and ice cream, this book takes you into more nutritionally sound territory.
But not this one. I read this in two gulps and could hardly tear myself away from it. Being pregnant, some of the birth scenes were a little intense for me but this is one of the best books I've ever read. I despair of ever writing such amazing characters!