Dr. Charles always provides information about other diet plans because he knows that not the same plan may not work for everyone. He also understands that the body adapts quickly and has found that if you can change up plans frequently, it will also boost your metabolism and break through any fat loss plateaus that you are stuck at on your current plan. However, you can always go back to the original plan if it was working better for you. Dr. Charles just wants to be sure that you are highly educated, so him and his colleagues does a lot of research to provide only the best nutrition and weight loss info for you.