Nonsense.
1- A mere 50,000 years is not enough for any evolution, so that mention is a clue that Jaminet knows not whereof he writes.
2- There is no evidence to support human evolution. None.
3- It takes at least 2 to 6 WEEKS for the human body to adapt to carbohydrate-free diet; during this period everyone experiences lethargy.
This has been known for at least 140 years (Schwatka), but not to Jaminet.