The ultimate test of what constitutes an optimum diet must be made on human beings under normal conditions of living. The usual method of attack on the problem is through carefully controlled laboratory experiments, in which the amount of one or more of the various dietary essentials needed to produce optimal storage is determined. Such studies are, indeed, essential to a fundamental understanding of nutritional needs. They are, however, costly and laborious, and so far as the period of childhood beyond infancy is concerned, only a bare beginning has been made by this means toward determining acceptable standards for the various dietary requirements. Even when such standards are eventually determined, they must still be tested in practical situations in terms of everyday foods before they will be generally accepted. One method of approach is to determine through large scale feeding the effect of adding certain basic foods to the diet
ROBERTS LJ, BLAIR R, LENNING B, SCOTT M. EFFECT OF A MILK SUPPLEMENT ON THE PHYSICAL STATUS OF INSTITUTIONAL CHILDREN: GROWTH IN HEIGHT AND IN WEIGHT. Am J Dis Child. 1938;56(2):287–300. doi:10.1001/archpedi.1938.01980140057007
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