The artificial meat probably will make "real meat" consumption obsolete eventually, but at the moment it is still way to expensive to be used in mass scale. Are we transitioning to a vegan species?

Actually insects have been a part of the human diet for ages ,it is even mentioned in the bible. Many cultures on earth already consider insects a snack. however, I have not learned about the fruitarian diet, but the first question I have about it is, where do we get the protein / amino acids from if we only eat fruit?
Thanks for reading and have a great day too!