John is right. Primitivism is a priori, research is a posteriori. You dont need to do a lick of research to know that processed foods are bad for you because you know that cavemen did not have access to them.
H/Gs didn’t have all the health problems we have in civ. 90% of your health is diet. Show me an H/G society with cancer and/or autism and other mental illness and I’ll retract my statements.