Would a human survive on a vegetarian diet in a primitive environment?

Lets say a modern human was born as part of a tribal culture, completely isolated to civilisation.

Would s/he survive on a purely vegetarian diet from birth? What about a vegan diet?

Also, methods of handling food are strictly primitive, so no dietary supplements.Would a human survive on a vegetarian diet in a primitive environment?
Absolutely! Some of our ancient ancestors were full time vegans and others had to maintain vegan diets for long stretches of times while traveling (they were nomads). Vitamin b12 comes from a bacteria, which is why it is very easy to get it in flesh, which is bacteria ridden. But it is also common in wild plants, even in streams where humans would have gotten their water from. But in our society, where everything is washed and santatized and filtered, bacteria carrying b12 does not exist in non-meat sources, which is why many vegans must drink fortified beveraged and eat fortified foods, or take a vitamin. B12 is a vitamin that is also needed in TINY amounts, and our system replenishes it. Some body's take 100% of the vitamin, use it, and recycle 65% of it. People can go 3-20 years without any b12.
As a vegetarian, probably. They'd eat eggs and probably have some sort of livestock: cattle, oxen, etc. to get milk from.



Vegan, no. Humans need vitamin B12. It's not available from plant foods nor can you get it from dirt (as some vegans will insist). It comes naturally from animal products. So if we're talking about a native, tribal culture where no dietary supplements are available, being vegan is not possible.Would a human survive on a vegetarian diet in a primitive environment?
it depends on what is available. probably not an ideal diet, but I suppose you could survive. if you live in an area that provides grain, nuts, fruit, veggies, and dairy you would be doing just fine.
Tempeh, miso, sea vegetables, and other plant foods are sometimes reported to contain vitamin B12, but in lower amounts. Vegetarians have survived in more primitive lifestyles.Would a human survive on a vegetarian diet in a primitive environment?
Of course they would.