Todd Moody wrote:

>Anyone who says
>they didn't eat grains has to explain why they rather suddenly
>decided to change their whole way of life to raise crops that
>they previously didn't eat at all.

First I have pointed out several times that there were six thousand years
of gathering before they took up farming. You can't make the claim that
they raised crops that they didn't previously eat. As for a theory, here's
one:

The origins of agriculture – a biological perspective and a new hypothesis 
http://www.vegan-straight-edge.org.uk/GW_paper.htm

in which Greg Wadley & Angus Martin argue that the shift to cultivation and
animal domestication was due to the "comfort" derived from the opioid
peptides from gluten.

Don.