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RE: LACTOSE INTOLERANCE: A CONDITION WHERE SOME OF US CANNOT DIGEST MILK PROPERLY
The sun produces vitamin D so people in the southern part of the globe can have vitamin D supplied steadily as they are much more exposed to sunlight unlink people in the north who rarely get adequate sunlight. Natural selection kicks in and people in the south do not need alternative sources of vitamin D so the lactose enzyme is not really a requirement. I’m however open to different opinions but this is my source of information here
That's not what I'm talking about. I'm saying I doubt that is the reason why those in the north have the lactose enzyme. Vitamin D in milk is a man made process that I doubt was present back in the days.
Oh I get your point. If couldn’t possibly be the ultimate reason. It’s more of a speculation.