It is about Fitness&Nutrition. We have already similar open threads, see the related. Now the issue is the slant. I propose its change to
"historical" where questioner makes it clear that s/he is interested in the historical evolution, comparing societies and perhaps covering some books that claim (without evidence) that some uncivilized societies have no XYZ problem as in in civilized socities (a straw-man in a way). Perhaps, the most popular book is currently the
"Born to run" -book, idealizing the far-away-living people... does there exist any evidence for its claims about harmfulness?