When we observe the diets of primitive tribes currently still in or close to the stone age, we see that they vary quite a bit. For example, the Kitava Island folks eat a lot of carbs (by our "paleo" standards), and the Inuit-like folks in north eastern Siberia eat about 99% whale and seal products. I have come to deal with these differences.
I doubt if the Kitavan folks eat as many carbs as the standard American diet. But there is also the good carbs and bad carbs thingie: There is a thing called palm sugar or coconut palm sugar. What you may find in the natural food store or Asian market will vary. I have seen granulated and a very hard paste. The science on this is very sparse. They say that the glycemic load is absurdly low, like 7. My experience is the GL IS very low. It is the nector of the coconut or palm tree flower. This would be a good example of a very low GL carb that primitive people might eat.
And the thing about the Inuit people's diet is that it does not appeal, so I doubt if the Sierra Club needs to worry about us paleo folks insisting upon the right to hunt whales and seals.
But there is almost certainly a genetic component to the health of these different diets. I am color-blind. Among you readers, perhaps 1 in 12 are color-blind. Genetic diversity is a fact of life. There will most certainly be a genetic diversity in the optimal diets that we eat. Each person has to find their own optimal diet.
Comments will be greatly appreciated.