From http://www.nature.com/news/archaeology-the-milk-revolution-1.13471
It’s not natural to drink the milk of another species. Europeans genetically mutated to tolerate cows milk – most of the world still gets diarrhea if they drink it.
Archaeologists unravel the history of milk drinking and plot the gradual genetic mutation of Northern Europe
Who Can Properly digest Cow’s Milk?
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