Why most people lactose intolerant?
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Because most people stop drinking milk after infancy. This means that we no longer need to be able to digest it, so the cells turn off the gene that lets us digest it so as to not waste energy and materials making an enzyme we don’t need.
The ancestors of Europeans and some other groups however found alternate sources of milk and continued to drink it, as well as make it into cream, cheese, butter and many other delicious things, and over time we evolved to turn that enzyme off later and later, and eventually not turn it off at all, because it was still being useful.
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