Yes and no. Animals, even the lean wild variety, carry a lot of fat, and our ancestors ate a lot of animals. Cold-water marine animals have tons of fat. Concentrated fiber-less starches don't really exist in nature at all, either. Tubers and fruits were much more common food sources than grains, and the wild ancestors of potatoes, sweet potatoes, bananas etc. all contained far more fiber than their domesticated descendants. In grains, the endosperm content of wild grains is a fraction of modern varieties.
With all the caveats about extrapolating from n=1 experimentation, this is a pretty wild story about a woman who reversed a lifetime of serious health problems after switching to a fully carnivorous diet: http://foodmed.net/2018/05/mikhaila-...irl-carnivore/
I think I said this in the prequel to this thread, but eliminating non-whole fruit fructose, seed oils, and refined starches is about 90% of the battle. That's the obesogenic trifecta. Just eat whole foods, everything else is kinda getting lost in the weeds.
I lost a lot of respect for him when he started doing the Primal Health Coach certifications. What a joke. The book and blog have always been loss leaders for the supplements and seminars (the guy made supplements for 20 years before writing the Primal Blueprint, that's his gig), but the PHC thing was a bridge too far. That said, there's plenty of sound advice in the PB, most of his products are good quality and reasonably priced, and he practices what he preaches and looks outstanding for his age. Just don't buy into his diploma mill.
Embrace La Croix.
Um, yeah, that's not how arterial plaque works, at all. Regardless, all saturated fats are quite liquid at body temperature (not your words, I know).