Couple of questions I have for anyone in the know about this.

While we may have not evolved a great deal over the last 30 thousand or so years, our bacteria may well have. That would cover our entire digestion systems mouth to anus. I suspect those bacteria have evolved in many ways that may mean we can eat a more modern diet without doing any harm or perhaps doing better. Has this been covered by any of the studies?

I have to question the avoidance of things like bread. Even in Paleolithic times we had crude forms of processed grains and bread. Are proponents of palaeo saying to cut these out completely or just cut out the highly refined kinds?