Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Snake oil anyone?

A number of people I know went on this diet and like many of the reviews swore by it. I was highly skeptical about this but still my curiosity got the better of it and I read though some of the book.One thing I found highly suspect is that the author apparently tested various foods in different types of blood types to see their reaction. Any sophmore science student should realize that digestion doesn't take place in the bloodstream.I also wonder if the "miraculous" results in many cases were people eating a balanced diet for the first time.If this diet were subjected to rigorous scientific method testing and proven to be beneficial then I would consider changing my view that this is just another fad diet.Advising people to exercise, eat a balanced diet and walk more frequently doesn't sell many books though.