It is a well known fact that vitamin A is necessary in the diet if normal growth and reproduction shall take place. In the absence of this particular dietary factor a condition known as xerophthalmia or keratomalacia results. It is equally well known that the higher animals cannot synthesize this vitamin and that they must depend, therefore, on green plant tissue as the ultimate source of the vitamin. During the past year some work has been done demonstrating that the quantity of this vitamin in milk will vary with the quantity of vitamin A in the diet.1 This is to be expected since the animal cannot synthesize this unknown substance, and consequently if the vitamin is not present in the diet the mother cannot secrete it into the milk.
Andrews2 showed that the milk of a mother whose children had died from beriberi, and whose diet was, therefore,
NELSON VE, LAMB AR, HELLER VG. THE VITAMIN REQUIREMENT OF VARIOUS SPECIES OF ANIMALS: III. THE PRODUCTION AND CURE OF XEROPHTHALMIA IN THE SUCKLING. Am J Dis Child. 1922;23(6):518–520. doi:10.1001/archpedi.1922.01910420049008
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