In this book, the focus is specifically on the role of sugar in our diet, and the likely possibility that the difference between a healthy diet and one that causes obesity, diabetes, heart disease, cancer, and other associated diseases begins with the sugar content. If this is true, it implies that populations or individuals can be at the very least reasonably healthy living on carbohydrate-rich diets, even grain-rich diets, as long as they consume relatively little sugar.
This makes some intuitive sense. I've never understood all the craze about paleo diets. Europe for a long time has had heavy amount of grain in the typical diet. Rice is the largest staple food throughout the world and has been so for a very long time.
