Used copy has sticker on back. Fast Tract Digestion Heartburn gives you a clinically tested, simple and effective dietary solution for restoring and maintaining your healthy digestion. The Fast Tract Diet was created based on solid scientific evidence backed by extensive research and the latest developments in medical science. The golden key behind the Fast Tract Diet is a proprietary formula called Fermentation Potential (FP) developed by a microbiologist, Norman Robillard, Ph.D., Founder of Digestive Health Institute. FP is a point system, so you are empowered to make your own food choices based on the guidelines and food tables in the book.