Eating meat: some say we've evolved to do it. It's in our DNA. It's how we got our big brains. Yet others, as far back as Pythagoras, have argued that eating meat is bad for our bodies, cruel to animals, and toxic to the planet.  Now -- perhaps more than ever -- when it comes to the matter of meat, clear-cut answers can be hard to come by. Kevin Ball serves up the arguments.  **This episode originally aired November 23, 2016.