The dictum "a quart of milk a day for every child" is largely the result of an investigation by Sherman and Hawley1 in which it was shown that the optimum amount of calcium is retained only when approximately 1 quart of milk is included in the diet. Calcium from other sources was found to be less available, lower amounts being retained when the calcium was supplied more largely from vegetables and fruits. The variations in the retentions of calcium of children who were living under comparable conditions as well as the results reported in more recent studies with both children and adults2 suggest that the difference in the amounts of calcium retained may be due in part to the lack of uniformity in the physiologic condition of the persons studied. For example, the potentialities of growth in children or the physiologic balance in adults may have been less
DANIELS. AL, HUTTON MK, KNOTT E, EVERSON G, WRIGHT O. RELATION OF INGESTION OF MILK TO CALCIUM METABOLISM IN CHILDREN. Am J Dis Child. 1934;47(3):499–512. doi:10.1001/archpedi.1934.01960100025003
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