Instruct: Classify Amazon reviews into positive or negative sentiment
Query: 9 words extended into 400 pages

Eat two grams of fiber for every 90 calories. That's it. That's the book. To some degree, that's the case with a lot of these diet books, but most of them reward the investment with a wealth of health information, nutritional studies, and medical data. This book is light on the writing, heavy on the filler -- a couple hundred pages of menu options, for instance. I couldn't shake the feeling that this was a rather cynical moneymaking gambit -- a Florida cardiologist trying to capitalize on the South Beach Diet by coining the 2:90 brand.In any case, there's nothing wrong with the book, or the advice it contains. Eat more fiber -- go on, do it. But this isn't a very good book, and the whole thing was too rife with self-conscious branding for me to enjoy.