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Milk, an almost complete food, consists of proteins (mainly casein ), fat, salts, and milk sugar, or lactose , as well as vitamins A, C, D, certain B vitamins, and lesser amounts of others. (Many people are unable to digest milk after childhood because they stop producing an enzyme needed to break down lactose, but usually they still can digest yogurt, hard cheeses, and lactose-reduced milk products.) ...
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