>> For now, I’ll keep eating like my grandparents ate - you know, real food.
One little problem with that is that your grandparents probably didn't eat what my grandparents ate. I'm guessing you're from a majority English-speaking country, the US, or UK, etc. I'm Greek. Our traditional cuisine is choke-full of strictly vegan dishes that are absolute staples [1]. Only of course no Greek would dream of calling those dishes "vegan". They are simply "food". And, I dare say, they are "real" food, the kind of food that grandma would make, as opposed to the stuff one can find in fast food joints etc.
The same goes for the "300,000 years of human evolution eating meat". Considering how far and wide humans have ranged during our evolution, figuring out what an average human ate would be very tricky. On the one hand, you have the diets of the peoples of the Arctic who eat predominantly meat from seals and caribou and the like. On the other hand, you have the diets of people in the Indian subcontinent who eat mostly pulses.
The bottom line is we've always been omnivores and we cant eat only meat any more than we can eat only plants. And we can't look at the plates of a few million people who have settled down in one part of the world and ignore the rest, who live all over the rest of the planet.
_________________
[1] Rather than me giving a list of Greek cuisine dishes with no meat or animal fasts etc in them, here's a blog post by a vegan touring Greek:
https://www.thenomadicvegan.com/the-nomadic-vegans-guide-to-...
The list includes spanakopita and xoriatiki (Greek salad) that are normally prepared or served with feta cheese as are many of the other dishes. Greek cuisine is not vegan, but a lot of it is lacto- ovo- pescaterian.
Note again that the dishes in the list above are staples- the kind of dish the average Greek would eat a few times a year.