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I'd agree that we will do what we need to do to survive but going on the basis of those that did survive to produce future generations there are no vegans possibly because they require supplementation and perhaps this meant in t he past they couldn't have successful pregnancies being deficient in iron and B12 for example.
It's our modern world/lifestyle that needs supplementation. In our natural environment, and without current sanitation, B12 would've been abundant. That it no longer is is the reason why most animals bred for human consumption are fortified with the vitamin (The animal's health and for those who eat the animal). In our modern world , B12 deficiency is certainly not reserved for vegans.
Iron deficiency is also a bit of a red-herring. Iron issues aren't solely the preserve of a vegan minority. Firstly, it seems there is a possible genetic component to the rise of this deficiency. Secondly, it seems pretty volatile in terms of absorption and co-factors needed for improved absorption. But a lot of it, especially on the vegan side of things can just be down to not knowing how to eat health-fully.
But the point seems moot. None of our ancestors were thinking about the philosophical implications of their diet (There weren't any, really) , so wouldn't have even attempted it.
Keto doesn't require supplementation and there are still hunter gatherers who eat t this way without access to supplements. I agree that those peoples might well have eaten grains had they been able to not having the luxury of choosing to only eat m
Not going to take an over-arching position on this, but in all my years around this diet-sphere (Including doing Paleo.Primal) I've come across lots of people who supplement while on keto. How much of that is a need and how much is 'just in case', I'm not sure.
I take B12, VitD and an occasional multi (Will probably drop them at the end of this bottle). I think these 2 are wise choices and because I am not making any claims to the naturalness of my diet (As you can see, quite the opposite) there's no detriment.