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That Fluid Called Milk

Agricultural Research Service, U.S. Department of Agriculture, Washington, D. C. 20250

ABSTRACT

Webster defines milk as a white or yellowish fluid secreted by the mammary glands of female mammals for the nourishment of their young, consisting of minute globules of fat suspended in a solution chiefly of casein and other protein matter, milk sugar, and inorganic salts. That secreted before delivery and for some days thereafter is called colostrum. It is yellower and richer in solids than ordinary milk and is adapted to the special needs of the newborn offspring.

Milk as a Food

Milk, then, is a food. For mammals, which includes humans, it is provided by the mother as the first nourishment for the newborn. Milk has unusual and near complete nutritional properties, especially for the young. Nutritionists often have called it nature's most nearly perfect food. Its properties and cpalities make it acceptable to the young and to most individuals of all ages. It is especially valuable as a supplement to other foods in providing balanced nutrition.