Nothing new--but sound dieting based on nutrition education and balanced recipes from a reliable source. Jones--who's advised the Pritikin Longevity Centers and various diabetes organizations, among others--goes with knowledge and understanding as the basis for a successful weight-loss regimen: food categories and groups are explained--along with calorie requirements, ideal weights (and the importance of exercise), and water and fibre intake. Then come the Basic, the Party (for entertaining, or if you crave more variety), and the Vegetarian Weight-Loss Diet. The menus and recipes are rounded out by cooking and lifestyle tips. Unintriguing rare (herbed vegetable medley, lemon chicken in envelopes), routine pointers (don't use a lot of oil). But also safe-and-sane.