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Section of Biochemistry and Molecular Biology, Division of Biological Sciences, Cornell University, Ithaca, New York
ABSTRACT
Milk is a product of biological evolution. It is a biochemical complex which appears to be the only material fashioned by nature to function solely as a source of food. For the infant mammal, milk serves as a bridge spanning the nutritional gap between intrauterine dependence and extrauterine independence.
The same nutrients are present in the milk of all species, although in different proportions. Such quantitative variations appear to be an adaptation to the nutritive requirements of the young of each species. In spite of the marked quantitative differences in milk composition, it is possible to adapt milk of one species to another. Thus, a major factor influencing the value of milk is the image it presents—one of nutritional potential unsurpassed by any other food utilized by humans.
The complements of proteins in milk are ideal in quality and balance to satisfy human amino acid requirements. The content of minerals and vitamins is unique, not only in proportion but in availability.
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