It wasn't clear to me that "protein" was generic for "meat", but in this specific case soybeans can be turned into tofu. And that's a reasonably popular protein

It wasn't clear to me that "protein" was generic for "meat", but in this specific case soybeans can be turned into tofu. And that's a reasonably popular protein source for humans in China -- especially if high prices of other human-consumed proteins causes product substitution.