Not that many people really believe the pseudoscientific rationale for the Paleo diet anyway, but a recent study provided further proof of its silliness. Here's the original paper, which is paywalled for most of us, and an explanatory article which is not.
For those who follow/advocate for low-carb and no-carb diets, please understand that I'm not suggesting they don't work (within the usual limitations of any such effort). But the silly evolutionary argument advanced by the originators of the Paleo diet is purely bunk, with no valid scientific basis.