There is an EXTREMELY wide range of macronutrient contents in the diets of native/traditional peoples. Macronutrient ratios bore me at this point. Come to think of it, anyone who argues for a macronutrient ratio for the whole human race automatically loses the argument.
One can make a plausible argument for facultative carnivory (though I wouldn't, at this point--I prefer my term, "adaptivore," currently), but not for a single narrow range of carb or fat intake for all human beings. A pox on the mythical models of both the low-fat vegans and the zero carbers who claim that all humans should eat like them. Neither has much of anything to do with reality or science. That's not to say that some people don't fare well on those diets, it's only when they expect or demand that everyone, or thereabouts, eat like them that I take issue.
I forgot to mention that folks can also search for info on our Stone Age ancestors as well, since the foods available to HGs today are not quite the same as was available in the past (basically, there were way more megafauna in the past).