Plant based?
wtf does that even mean?
My diet is plant based.....I eat mostly plants. I eat fish I catch, and eggs from ducks and chickens I keep. Those animals are insane at recycling nutrients into bio-available from, as humans over millennia figured out.
To replace the animal proteins from eggs and fish that are immediately available to me at basically zero ecological cost I'd have to clear a lot of land to grow the equivalent in soybeans or lentils.
Thats if I did it myself, otherwise I'd have to outsource it to farms with a much higher ecological cost.
Far as health goes, replacing the micro-nutrients, long chain fatty acids etc etc from the fish/eggs with plant food is much, much harder if you eschew supplements.
The external supplement regime of those athletes in Game Changers was not mentioned but I bet it would be significant.
the vegan diet is pretty much an expensive indulgence for rich, western people.