I did the South Beach diet without really understanding how and why it was working. This book does a much better job of explaining the science behind it. If you're trying to understand the latest hype about "low carbs," and to separate out inaccuracies from facts, then you need to read this book. Ravage explains in clear, accessible prose, how high glycemic foods affect weight gain, why the hype about a "low carb" diet is misleading & potentially unhealthy (there are lots of good & necessary carbs), why "diets" don't work, and how you can really change your eating habits to lose weight and improve your health. It has great advice and tips for healthy and delicious meals and snacks. And, best of all, there's an exhaustive list in the back of the book that rates every food that has been tested for its GI index and tells you whether that food is high (bad), medium (OK), or low (great!) on the GI index. Makes food shopping and menu planning so much easier. I highly recommend this book to people who are thinking about changing the way they eat.