[Zormad]

@Abi: And here is something about the importance of good fatty meat in the diet of the Great Sioux Nation I don't know if you meant east or west northerners though.

http://www.dlncoalition.org/related_issues/2003jan12a.htm

I can't find it but I remember reading about how a lot of the fat in their diet wasn't "counted" while being studied. Look into rabbit starvation, where people would starve from only having access to lean meat.