Sports Nutrition for Endurance Athletes provides sound nutrition guidelines to boost athletic performance in seven of the most popular endurance sports.    Endurance athletes will learn how to assess body composition and find healthy approaches to losing body fat and building muscle. Ryan also gives practical pointers such as a review of popular ergogenic aids, tips on meal planning, typical shopping lists, sample menus, glycemic index of foods, facts about vitamins and minerals, and a comparison of sports nutrition products.     Paperback. B&W photos, tables, and menus throughout.     7 3/8" x 9 1/4", 368 pp.