This is bound to be popular with fans of Berger's previous best sellers, The Immune Power Diet ( LJ 4/1/85) and How to Be Your Own Nutritionist ( LJ 4/1/87). Berger discusses current research on maintaining youthful skin and how to have a healthy heart and bones. He returns to his specialty of immune system longevity and includes a chapter on brain power rejuvenation. The material is packaged and presented well, a talent of the author. If the reader wishes to deal with facts of aging in order to halt the process as much as possible, this book is ideal. For a ``second opinion,'' try Gershon M. Lesser's Growing Younger: Nutritional Rejuvenation of People Over Forty ( LJ 11/15/87).-- Allayne C. Heyduk, Riverside Sch., Oneonta, N.Y.