Lactose is a naturally occurring sugar you'll find in milk, while lactase is the enzyme that helps us digest it. The thing is, for most of our existence, the human species has only been able to produce lactase in the early years of life, rendering the consumption of milk during adulthood an untenable affair. Over on Nature , Andrew Curry describes how milk was essentially a toxin for early humans, and it was only through a fortuitous genetic mutation that some of us developed the ability to digest milk in the years after adolescence.
via The Verge - All Posts http://www.theverge.com/2013/8/6/4593546/the-history-of-milk
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