It sounds like you're really asking "Are there any long term zero/VL carb paleos?" Paleo does not mean not eating plenty of vegetables. Even low carb paleos often eat piles of greens, berries and other non-starchy plant food. A lot of paleos also eat tubers such as sweet potatoes. Paleos who have insulin resistance are more likely to eat on the lower carb spectrum, while insulin sensitive paleos who work out a lot often eat higher carb. What we know is that paleolithic era humans did not eat any significant amount of grains, beans or concentrated sugars, & no refined oils, grains or sugars.
So yes, paleolithic humans certainly lived long term on a paleolithic diet - which varies. Modern hunter gathers such as Inuits lived for many years on extremely low carb diets. African "pygmies" (various tribes lived on primarily (but not exclusively) plant food especially mombongo nuts. Kitavans eat lots of starches mostly from tubers with coconut and fish and fruit. –
