My understanding from living in caribou country is that if you were to only eat caribou you would starve to death. Not because caribou is zero calorie food but because it is a neutral to negative calorie food. You will burn more calories by preparing, chewing, and digesting it than you will be able to store. That has always been the way it was explained to me.
So ...
IF you eat ONLY Caribou.
You DIE.
Thanks for the info.