Personally I don't really care what people ate in those days For me it is about how it makes me feel - I've more energy, feel younger than I have in years, and almost all of my health problems reversed themselves very quickly after adopting this approach (digestive system issues within a couple of days). There are certainly Paleo/Primal proponents who turn all of this into a religion - but for me it is all about the results. I fall more into the Primal camp myself rather than "pure" Paleo (I will consume some forms of dairy occasionally even though I am sensitive to it). To me it is all about finding what works for our specific bodies, that is what matters in the end. I tend to be more pragmatic than dogmatic