Instruct: Classify a review as either positive or negative.
Query: It's a great book, but difficult to understand right

Yes, this is a great book about loosing weight. However, it seems not easy to grasp the essence. The previous two reviewers apparently interpret it as 'not combining proteins and carbohydrates' and 'low carbohydrates' respectively. In fact the basic rule is not to combine fats and carbohydrates. See my further comments at http://www.geocities.com/HotSprings/4582