So what would the low levels of lactose tolerance in north africa and the middle east mean?
People with lactose intolerance make do with fermented products that contain lactase ~ kimchi, saurkraut, yoghurt, and so on.
Eventually the old boys got a hankering for those early Rhine maidens who had something like 500 genes modified to allow for persistent lactose tolerance, and the rest is history ~ ARAB WOMEN WITH STREAKED HAIR!