Earlier this year, Taco Bell revealed that its 'beef' was only 88% beef. The other ingredients included oats and cellulose.
I don’t notice it at other locations. It’s not objectionable to me, but it does taste like what I said. This is a KFC/Taco Bell store.
In all cases, I prefer they create safe uses alternative for the leftovers instead of just throwing away food. Of course McDonald’s doesn’t actually have much edible food.