Lieberman, a nutritionist, and Bruning, a freelance writer, (coauthors of The Real Vitamin and Mineral Book) detail a weight loss program designed to raise metabolism. According to the authors, many people who need to lose weight have become "metabolically challenged" because of crash or fad dieting, a sedentary lifestyle, chronic stress and eating the wrong foods. Some diets restrict intake so severely that the body responds by slowing metabolism to conserve energy. Others, such as those that limit carbohydrates in favor of fat and protein, may actually be dangerous to your health. Lieberman advocates a combined strategy of sensible eating, exercise, relaxation techniques to relieve stress, and the use of over-the-counter weight-loss supplements. The dietary plan suggested here is based on 50% carbohydrates, 30% protein and 20% fat, prohibiting junk foods and promoting food with a low glycemic index (the rate at which the food raises blood sugar). There is not much new in the author's ideas about good nutrition, exercise or overcoming stress, but her emphasis on taking supplements is more controversial. For those who have difficulty losing weight even when a healthy diet is followed, Lieberman advocates using supplements such as green tea, ephedrine, caffeine and pyruvate that burn fat or boost metabolism. Information about proper dosage is included. Targeted toward women who continue to be preoccupied with body size, Lieberman's program will find an audience. (Mar.)
