Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It will change your life for the better.

I picked up this book because I was ambling along 20 lbs overweight, approaching 50 and not feeling all that good about myself. What I read was completely in sync with what I always knew to be true but was presented in such a no-nonsense style that I decided to act on it. The results have been better than I hoped for. Read this book.