Without access to large amounts of fat from large game, humans may rely more on plant foods and carbohydrates due to biochemical needs.

“without access to large game we don't have access to large amounts of fat anymore this is probably a major driver for the amount of plant foods and carbohydrates in indigenous diets that we are filling in that niche that is left by the biochemistry that i talked about with the urea cycle we need carbohydrates if we can't get a lot of fat”