To Meat or Not to Meat?

Here's a recent article with problems. Carnivores are not the only predators on Earth, and therefore our own lack of carnivore teeth does not absolve us of our Prion-Immunity Gene sweeping past:
http://www.npr.org/sections/13.7/2016/05/19/478645426/humans-are-meathooked-but-not-designed-for-meat-eating?utm_source=facebook.com&utm_medium=social&utm_campaign=npr&utm_term=nprnews&utm_content=20160519

And then there's this:
http://www.npr.org/2010/08/02/128849908/food-for-thought-meat-based-diet-made-us-smarter

To Meat or Not to Meat?