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> Do you know why we drink milk after infancy? Because we evolved to.

"We" in this case being, essentially, Northern Europeans. Lactase persistence isn't really the global norm.

"We" in this case is actually those human cultures with large backgrounds in herding. For example the Maasai, Kenyans, Tanzanians, and Sudanese tend to not be lactose intolerant. I think we'd agree they're not Northern Europeans.

That being said, yes it's not a global norm.

It is more widespread than you might think. This article tells the story of the potential role of milk in the growth of the agrarian way of life: http://www.nature.com/news/archaeology-the-milk-revolution-1...

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