Also, ketosis would not have been a state our ancestors were in all (or even most) of the time: they likely ate fruit, starchy tubers & tons of honey—as modern hunter-gatherers do. They would have been in ketosis when carbs ran low, but in many regions this might not have been often, in a world of Stone Age abundance.

I don’t want to lose fat—being too skinny, I want to gain it. So do I get skinnier on keto?

Nonetheless I’m intrigued by keto, as many report such great gains, & would welcome your comments on the above.