> I presume you are referring to "The origins of agriculture –
> a biological perspective and a new hypothesis" 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:
>
http://www.vegan-straight-edge.org.uk/GW_paper.htm

Here's a quick quote from the above:

'Few topics in prehistory', noted Hayden (1990) 'have engendered as much
discussion and resulted in so few satisfying answers as the attempt to
explain why hunter/gatherers began to cultivate plants and raise animals.

Glad to know I'm not alone in my puzzlement :)

Robert