Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Can't do without this book!

As a carb addict, this book is invaluable to me! It makes a Low-Carb lifestyle EASY! I have the Eat Yourself Thin Like I Did: Quick and Easy Low Carb Cookbook, too - I highly recommend both! Many ingredients are available through the website www.low-carb-cookbooks.com, which is nice if your local grocer doesn't cater to the low carb folks!