Talk:Plants vs. Zombies 2/Upcoming content/@comment-26851138-20151119021721/@comment-26593304-20151119061857

Cottonmouth has a good point. Prehistoric humans could digest certain types of bacteria that would make us sick. Why? They ate raw meat. Upon discovering fire, we began to cook meat and such, which made it taste better and eliminated a good amount of bacteria. Due to the reduced bacteria, whatever defense we had against those ones slowly went away as we intook less and less of it. Now we have no defense against them and therefore they make us sick.