Instruct: Classify Amazon reviews into positive or negative sentiment
Query: I believe that you need a PHD to understand this.

I borrowed this book from the library the other day. I'm sorry but I could not understand how to calculate the formulas that are required to start this diet. I was looking forward to starting this diet and hopefully experiencing a new way to loose weight. At this point I feel discourage and I will purchase the Dr. Atkins book. I find it hard to follow certains recipies I would much prefer to have a food guideline to follow. Please help me figure out this chart as I am desperate to drop at least 20 pounds by the summer. Also, I would like to know if anyone has also had a hard time to figure out these charts.