Homo Sapiens are carnivores...not herbivores or omnivores.
Meat is highly nutrient dense and saturated fat is vital for reasoning brain function.
If we all went vegan, we would all become irrational sickly children and go extinct like A. Robustus, most likely.
https://www.youtube.com/watch?v=pIRurLnQ8oo
https://www.youtube.com/watch?v=bY2v6AnEyuU
We evolved into consciousness because of meat diet.