I purchased this book because I had read about the Glycemic Index in my diabetes magazines, and although I didn't understand the information well, I did think it might be useful. I was disappointed. My primary concern is that, as described in the book, the Glycemic Index Values are determined by far too small a sample, and with rather vague criteria. I also disliked the style of the book, which seemed to promise a cure for everything from obeisity to hangnails. In the end, I didn't finish the book, but am keeping it in hopes that the values in the back, although questionable, might be useful.