In that case, your body will launch into gluconeogenesis, and convert fats and amino acids into glucose, so ATP synthesis can continue in your brain cells.
So rather than focusing on sources of glucose, they consumed large amounts of fat and blubber, which allows their bodies to produce glucose through a process called gluconeogenesis.
I think there's definitely a lot of crossover between, like, for example, I know metformin does inhibit gluconeogenesis, and so does a bunch of other, like, well-known type 2 diabetic medications that are prescribed.