The paleo BS is where I depart from the rest of the low carb weirdos. The idea of a "paleo" diet is so ridiculous it deserves mockery. There is no way a modern human could come close to approximating a non-modified food diet, in the first place. That, of course, leaves out the fact that grains and the domestication and modification of other crops are what helped propel humanity to its current state. Does that mean a high carb diet is healthier than a low carb diet? No, but the idea that we can't even process modern carbs is laughable.
I eat whole foods 90% of the time, and could easily do it the other 10 if I weren't carb back loading for hypertrophy goals.
Humans are humans because of *not* eating grains/legumes/processed foods, etc. For the entirety of human history, our diet resembled an ancestral diet for all but the last few thousand years. To illustrate it...if a football field represented human history, our diet started including grains on about the one yard line, and processed seed/vegetable oils at about the 6 inch line.
We have the brains we have because we ate fat, organs, brains, etc. Smaller teeth (incisors and cuspids) allowed for more room in the jaw for brain development, etc.
No one is saying modern humans can't survive on or process "modern" carbs, just that it isn't optimal and is leading to diseases not seen on this scale in history until the last several generations.
Our bodies have a limit on sugar/carbs intake and processing. Never used to be a problem when fruits were the only way to get them. They came with a fiber bolus, were only available at certain times, and would have been impossible to consume in amounts that can be had now with just a couple cokes and a bag of m&ms.
Lots of research out there.