One other thing that gets lost, often, when you're looking at populations eating their traditional diet is that what you can eat when you have a healthy metabolism and what you can eat when you've already broken it are not the same.

It's at least possible that I had not eaten crap as a kid, I could indeed eat more carbs and such than I do now (I am real dubious about this whole grains crap regardless, but sure) but I, and loads of other Americans, are not that in that position.

And I have the blood tests to show that by the standards of the same community that recommends it, 'healthy' diets literally kill me.