In addition, I think the magnitude of opioid effect
> is not nearly strong enough to explain the magnitude of the
> dietary shift. We're not talking about opium poppies or coca
> leaves here.
Do some more research. Both glutens and caseins are able to cross the
blood-brain barrier due to their remarkable similarity with endogenously
produced brain chemicals, and once there they can and do lock into opiod
receptors.
Andrew