The Beverly Hills Diet by Judy Mazel, gives a great deal of insight into food, enzymes and how to maximize the "power of the pineapple"! I first tried this diet in the summer of 1982, and lost thirty pounds, keeping twenty off for over 10 years. The problem was that I couldn't stay on the diet for more than 8 or 9 days at a time before becoming violently ill. Ms. Mazel's idea of using fruits to compensate for bad eating days, as encouraged in this book, has stuck with me over the years, and I use it to this day. The diet is updated and far healthier in her New Beverly Hills Diet book, but having read and tried both, I can tell you the results are not as instantly gratifying in the new version.