Yeah, there's a documentary that Cornell University did on The China Study that you'd probably find very interesting. In the cold north they have no choice but to eat a lot of meat. The China Study was fascinating to me because something like 84% of the population are Han people who share similar genetics, at the time the study was done, they didn't move much, and their diets varied dramatically according to whether they were on the coast near the ocean, or near a river, or warm inland area, or in the north.
The thing that jumps out at you is fresh produce makes all the difference.