Also we're very very good at fasting (using our fat store):
https://en.wikipedia.org/wiki/Angus_Barbieri%27s_fast
382 days without eating and no issue at all.
This isn't true. Although the Intuit people were largely carnivorous, they did not have a "keto" diet. They ate a lot of meat, but the animals they ate have extremely high amounts of natural glycogen. They also did not eat as much fat as expected, because animal fat was their source of heat and light for long winter nights.
> ...When is abundant, the average daily diet of the adult Eskimo consists approximately of 30 to 40 grams of carbohydrate (which includes glycogen), 250 to 300 grams of protein, and about 150 grams of fat (FA/G=1.2). These amounts of meat are apparently not heroic, for it has been alleged that the Yakuts, on the Low Steppe, east of the Lena, eat as much as 25 and 30 pounds of meat a day.” —I.M. Rabinowitch (1936)
If you are curious, this is an accessible review of the available materials.[1]
[1] https://web.archive.org/web/20201112035644/https://www.freet...
(According to the linked Wikipedia article.)