I've been reading about all of the Arctic explorers' land-based excursions, and the journals of the British officers like Franklin express alarm at the uncouth behaviour of the Indians and Inuit when they kill a deer or caribou after several days without food - they dove face first into the stomach contents and ate them raw. Of course this would contain the undigested grass and whatever plants they had eaten, containing Vitamin C. They also report that the voyageurs doing all of the paddling, portaging & heavy loaded work loved to eat fat, even bear fat.

Of course the successful Canadian and British explorers like Stefansson, Rae, Dease were successful because they "went native" and learned how to hunt.