Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A great book on nutrition but a bit hard to understand

This diet is absolutely wonderful. It is similar to the Atkins diet which I have been following. I feel great and for the first time in years, my ulcer isn't bothering me. I have lost about 20 pounds combining the low carbohydrate diet and exercise. Both the Atkins book and this book are wonderful but I prefer Atkins as easier to follow. Protein Power has more scientific evidence but Atkins is more understansdable. However, you can't go wrong with either book if you follow the diet plan.