JulianMorrison comments on How minimal is our intelligence? - Less Wrong
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I don't think 'epigenetic' means what you think it means. But anyway: yes, there is anthropological evidence of that sort (covered in Pinker's Better Angels and in something of Diamond's, IIRC), and height and mortality are generally believed to correlate with health and presumably then to IQ.
The problem with that is that that is a problem for all theories of civilization formation: if early farming was so much worse than hunter-gathering that we can tell just from the fossils, then why did civilization ever get started? There must have been something compelling or self-sustaining or network effects or something about it.
So, suppose it takes less IQ to maintain a basic civilization than to start one from scratch (as I already suggested in my Africa example), and suppose civilization has some sort of self-reinforcing property where it will force itself to remain in existence even when superior alternatives exist (as it seems it must, factually, given the poorer health of early farmers/civilizationers compared to hunter-gatherers sans civilization).
Then what happened was: over a very long period of time hunter-gatherers slowly accumulated knowledge or tools and IQs rose from better food or perhaps sexual selection or whatever, until finally relatively simultaneously multiple civilizations arose in multiple regions, whereupon the farmer effect reduced their IQ but not enough to overcome the self-sustaining-civilization effect. And then history began.
There are probably pure-win half steps, like the kind of farming where you plant in the seasonal area you always come back to at a certain time of the year, as you follow the herds, or the kind where game is so plentiful you can afford to settle, hunt, and dabble in farming vegetables beside your settlement (such as in the American Pacific north west). Farming seems to be tied to settlement. Farms stabilize settlements; settlements nurture farms. And farms domesticate crops, making farming easier and supporting a larger population.
In the Mesopotamia region, there were settlements in the rainy hills where the local wildlife was conveniently easy to domesticate but farming was hard. Those moved down centuries later into the rainless flood plain between the Tigris and Euphrates, where only group effort could ensure irrigation, and group surpluses were needed to stave off bad harvests, but farming worked well. The "Ubaid period" (neolithic) was pretty egalitarian, but centralization emerges in the "Jemdet Nasr period" and kingship in the "early dynastic period" (Sumerian for king is "lugal", "lu"=man, "gal"=big, and initially it seems to have been just a word for "boss"). With centralization and kingship, empires follow fast. Civilization was co-existing with non-farming groups, but civilization tempts even non-farmers to switch from hunting to raiding. Sumer got sacked repeatedly by nearby tribes.
I am thinking there was a demographic transition point, probably quite early, when the number of people that could be kept alive - not as healthy, but alive - by farming or equally by raiding the surplus of farmers, exceeded the carrying capacity of the local game and wild plants. At that point walking away from the fields was not possible. Therefore agriculture has a ratchet effect.