The proprietor of an international chain of weight-loss centers puts her program in print with this all-round advisory on taking and keeping it off. In context, it's nongimmicky, nontechnical in the extreme, moderate in demands, and sensible--though that means that the message is also ail-too familiar: Set goals that are reasonable and specific; don't diet without exercise; expect and learn from lapses; satisfy your taste with herbs and spices, not fat and sugar; be firm with saboteurs; and so on. In format, though, it is, if not gimmicky, at least busy. Chapters are ""modules""; food groups, following the American Diabetic Association model, are ""exchanges""; and the book is full of menu charts, assignments, self-analysis checklists, quizzes, lists, boxes, and ""Thank you, Jenny Craig"" letters from happy losers. Then there are recipes. None of this can substitute for group pressure or the commitment that comes from paying a boodle and signing up for scheduled sessions--but that could be said of any diet book. This one surely rates a hearing.