Milk does not naturally contain very much vitamin D, so that's a silly reason to expect lactase persistence to have evolved. The original study[1] doesn't sugg

Milk does not naturally contain very much vitamin D, so that's a silly reason to expect lactase persistence to have evolved. The original study[1] doesn't suggest a connection between lactase persistence and vitamin D. It does discuss those topics in close proximity, though, which I suspect misled the author of the (popularizing) Science article. [1] https://www.biorxiv.org/content/early/2015/10/10/016477 https://www.biorxiv.org/content/early/2015/10/10/016477