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Laboratory evidence has indicated that low or inadequate protein diets usually result in partial inhibition of growth (1 to 3), depletion of tissue protein (4, 5), hypoproteinemia (4, 6 to 8), anemia (8 to 10), and variable edema (6, 11). Evidence derived from field observations of humans subsisting on protein-deficient diets has been equivocal. Growth inhibition and weight loss to the point of cachexia have been apparent (12, 13), but hypoproteinemia, definite anemia, and edema have not always been prominent (12, 14 to 16). In these latter instances, the concentrations of total protein and hemoglobin were determined. Since it is rather difficult to evaluate a three-dimensional function by means of a two-dimensional measurement (17), significant changes in the total quantity of hemoglobin and plasma protein may have been masked by measuring concentration without regard for the expanding or contracting blood volume. Consideration of the total circulating amounts of plasma protein (18 to 20) and hemoglobin (21, 22) presumably should afford somewhat better insight into the dynamic changes induced by protein deficiency. Four reports pertaining to total circulating protein (23) and total circulating hemoglobin (24 to 26) in the inadequately nourished rat have been found in the available literature. None of these was related to the effect of acute or chronic dietary protein deficiency in the growing animal which is the principal consideration of this report.

PLASMA PROTEIN AND HEMOGLOBIN IN THE PROTEIN-DEFICIENT RAT. A THREE-DIMENSIONAL STUDY 1