Vegans and vegetarians live without consuming meat. There's plenty of plant substitutes for the nutrients we get from meat (nuts, mushrooms, soy and so on).
That's quite interesting. I've heard that there are some substances which human body need and which can be found in animal flesh. I've just googled for that and it seems there are plenty of articles confirming that. So I don't know who is right...
Here are just 2 random articles from google search:
This is true. The only human derived food that we know of is breast milk.
Can we create a food from our stem cells?
This is mostly a random thought experiment. It’s not to actually trying to feed the human population nor is it based on hard science.
I keep thinking of how plants can synthesize their own food due to photosynthesis. Animals and birds and mammals and insects cannot...I keep going back to the origins and evolution of photosynthesis, but don’t have the scientific background to figure why we can’t do it too..or rather..what do we need to modify in our habits or genes to be entirely a self sustaining species.
Here are just 2 random articles from google search:
https://www.healthline.com/nutrition/7-nutrients-you-cant-ge...
https://www.alexfergus.com/blog/8-proven-reasons-why-vegan-a...