Human evolution is poorly understood, and the assumption that any choice $X supposedly made by early humans led to our forefathers’ anamolously rapid brain development is flatly speculative.
> Unlike most great apes today, whose diet is primarily plant based, we can thank the incredible nutrient density in meat and our incredible hunting and tool creating ability for prefrontal cortex development.
Complete and utter speculation.
> We were pack hunters, forging tools and strategies capable of taking down mammoths. Call it 'diabolicaly evil' if you want, but this is simply nature and survival.
Subsistence hunting amongst early human tribes is not comparable to modern day factory farming in any conceivable way.
B12 doesn’t come from eating plants OR animals: it comes from bacteria, and ironically that bacteria is in such short supply on factory farms that the animals need to be injected with synthetic B12.
> I don't personally believe highly processed plant alternatives such as Beyond meat are a long term option if you're even vaguely interested in your own health.
I eat raw soybeans, legumes, grains, nuts and seeds. I’d recommend watching the documentary Forks Over Knives [1] if you care about your personal health, and the documentary Dominion [2], if you’d like to see what really happens on factory farms.
[1]: https://www.youtube.com/watch?v=YtnlwqEii2I
[2]: https://www.youtube.com/watch?v=LQRAfJyEsko