Now that we're past the propaganda part of this marginally researched story, we might imagine the researchers will next examine WHY some folks have alleles of these two genes that don't produce the protein necessary for metabolising insulin.
I'm just guessing it's going to be that same minority group, the hunters, gatherers and herdsmen who have all the rest of the pre-starch/sugar/agriculture characteristics.
ping
It might change whether or not those genes are expressed, though.