If I said that Eskimos eating their traditional diet were eating processed carbs, what would you think?
|Structure of the chitin molecule, showing two of the N-acetylglucosamine units that repeat to form long chains in β-1,4 linkage.|
If Eskimos consume the stomach contents of the animals that they kill for food (they usually consume the whole animal, sometimes after leaving it for a long time to auto-digest), there is likely to be a significant amount of pre-digested chitin in their diets. Freshly-killed animals also contain glycogen. Therefore, Eskimos eating a traditional diet ate more carbohydrate than you would expect, which would reduce/eliminate ketogenesis.
Then there's the protein... See STUDIES ON THE METABOLISM OF ESKIMOS.