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A proper evaluation of the individual living body and its functional characteristics is not possible from the simple classification system of the butcher.. . '. With these remarks Keys & Brozek (1 953) dismissed the contributions of anatomists to body composition measurements and introduced the concepts that still sustain modern investigators in this field. These are that meaningful nutritional and physiological investigations in energy metabolism are those focussed on a distinction between the relatively inert components of the body and those that are metabolically more active. The former consist of extracellular fluid, bone mineral and depot fat and the rest, muscle and muscle-free lean tissue. Similarly, Siri (1956) suggested that a distinction between fat, minerals, protein and water provided a physiologically useful compartmentalization. These views were in fact simply more elaborate statements of an earlier idea Either way these propositions indicate first, what it may be useful to measure and second, that, with the addition of weight measurements, the size of a single unmeasured compartment can be calculated if estimates are available for the other components of the system.
Coward et al. (Fri,) studied this question.