Instruct: Classify Amazon reviews into positive or negative sentiment
Query: IT WORKS.

After hearing about this book from a friend, I tried its recommendations and dropped 15 pounds in a month that included a fair amount of cheating for Thanksgiving and Christmas. I experienced little hunger and fatigue and noticed increased mental alertness. What I like about the book is that it gives you the tools to maintain lower weight over the long haul -- less sugar,starches, and certain fats; more lean meats and vegetables; and more of the "essential fats." It's not a fad diet or something that requires lots of extra time be worked into your daily schedule.