Yes do read PP first book because I feel that it is the most important. Ptotein Power Lifeplan to me only serve to reenforce what they said in the first book. They also include suggestions and recommendation but the concept is the same as in the first book. The Eades go in great depth to prove to the reader that we are meat eaters omnivores and that we have not evolved enough genetically to properly ingest grain products. After reading the second book, I found it a lot easier to abstain from eating breads, doughnuts,cereals and all of the grain derivatives. PP works good for me and I keep it simple. If I ever regain 10 lbs back, I will re read those two Eades books again.