Accurate body composition information is considered to be more difficult to obtain in the elderly than in younger age groups for a variety of reasons . Several methods are available for assessing body composition, but it is questionable whether some of them can be used in an older population. In clinical practice, anthropometry cannot adequately estimate nutritional status, and measuring fat mass (FM) and fat-free mass (FFM) is recommended. Among the various methods, dual-energy X-ray absorptiometry (DEXA) is the most suitable for evaluating FFM and FM, regardless of FFM hydration. Bioelectrical impedance analysis (BIA) accurately estimates body fluids (total body water and extracellular water), but its reliability in assessing FFM depends on hydration status.
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