Dairy foods

Alpaca, camel, cow, horse, goat, sheep, and yak milk and their products are consumed today, but none of these animals were domesticated until the Neolithic.  Domestication is required for dairy products to become a significant part of any diet so, like grains, although milk would not have been unknown, it would have been so rare as to be irrelevant to the Paleolithic diet.  People today who are lactose-intolerant are manifesting an inherited Pleistocene lack of adaptation to milk.  These comments do not apply, of course, to breast-fed human milk which has its own unique fat/carbohydrate/protein profile but which cannot be utilized indefinitely, as growing children lose their ability to digest it fully.

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