Body composition during nutritional repletion of severely undernourished men

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Abstract
Body composition was studied in severely undernourished adult male inhabitants of a rural area of Colombia to evaluate the extent and the time course of the changes occurring upon nutritional repletion. During a 45-day basal period on a low (26g/day) protein diet containing adequate calories, body fat depots increased significantly (mean ± SD = +3.02 ± 2.9 kg), and there was a significant decrease in cell hydration from 81.8 to 76.4% (−5.4 ± 9.1%). Upon protein repletion (100 g/day), cell hydration decreased significantly to 71.4%, while body cell mass increased markedly (9.0 ± 1.1 kg). During protein repletion, muscle cell mass increased significantly (+5.5 ± 0.6 kg) and rapidly, while the increase in nonmuscle cells (+3.5 ± 3.8 kg) and specifically in red cell mass lagged behind. With repletion, the changes in the absolute values for plasma volume (+0.4 ± 0.13 liters) were significant, but those in extracellular fluid volume (−0.7 ± 1.9 liters) were not. Thus, the major compositional changes observed occurred in the body fat and the body cell mass components; these occurred independently of each other.