Body composition studies are used in a wide variety of fields including human biology, medicine, sports science, epidemiology and nutrition. They may be used to predict later body composition from childhood measures, bone density loss in athletes under heavy training regimes or in the elderly, to assess obesity in children and adults, and to investigate the likely effects of malnutrition. Recently, there has been a resurgence of interest in the field of body composition, together with rapid development of a whole new range of assessment techniques. In this volume, new and old techniques are evaluated, and future developments and aims are discussed. The chapters assume little background knowledge, and will therefore be invaluable to nutritionists, biologists, clinicians and medical physicists alike.