human genes linked to cereal and other farming

A prlp2 variant(helps to break down fats in plant fat) has been linked to cereal eating,occuring  in about 0.5 of cereal eating population,wheras lower in at about 0.2-3 in non-cereal eating population.

TRPV6 variants have been linked to lactose tolerance,aids in digestion of milk.

Populations descended from farmers in europe and the middle east tend to have slower acetylation versions of the NAT-2 genes(whereas hunter-gatherers usually have fast acetylation version of such genes.)
Search Amazon.com for milk