Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Beware of books that advertise

I have been researching fasting, cleansing, and detoxification for a while now and ran across this book. From the site it sounded like the all exclusive answer to your cleansing questions... however, there is a huge flaw. It talks about two formulas to use in "the cleanse", and it doesn't give you those formulas... instead you have to go to the website that sells the products at a not so reasonable price. I was immediately disgusted with the fact that this is actually and book length ADVERTISEMENT, not a book. It may give you some great facts, but it is fluff for the sell of his products. Well, beware... there are much better books out there like Daniel Reid's "Tao of Health, Sex and Longevity" that cover the topic of cleansing and much more. Be wary of any book that withholds information for no good reason besides profit.