Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not worth buying if you are serious about wait loss.

I bought this book, and although it is humorous, I feel it is downright irresponsible. It makes a small disclaimer in the beginning about not using the book if you are a teenager or have an eating disorder. My guess is, if you follow much of the advice in this book, you will end up with an eating disorder. There are a lot of suggestions that are potentially dangerous to your health, and don't offer almost any of the risk factors involved. Of course it is meant for a mature adult to read, and decide for themself, but there are many other books out there that have much better ideas about getting skinny. By the way I have many friends who have healthy, lean, and strong bodies who simply eat healthfully and work out a couple times a week. If your smart, you will know that moderation in eating and moderate exercise is the way to go.