Instruct: Classify Amazon reviews into positive or negative sentiment
Query: a terrible waste of time and money

This book taught me nothing new. I think the author put together a lot of evidences and facts already published. He does not know his subject. He writes as an example that a person who drinks eight Diet Cokes a day and eats nothing can't be healthy. Well, doesn't everybody know that? Mr Garcia's definition of slow, fast and mixed metabolism is unclear, and leads to nothing, simply because Mr Garcia is not a specialist, nor an expert. He is just an amateur fancying that he has "helped celebrities and stars..", which to me is absolutely no proof of anything. I was so disgusted by this abuse that I sent his book back to him along with a letter similar to this review.