I was reading this blog which was attacking the primal and paleo lifestyle: Paleo/Primal Opinion - Boise Fitness Factory and one statement really stood out:

First of all, our bodies attack bacon (i.e. one of the main “animal fats” paleo/primal enthusiasts endorse) as a virus. That’s right…our bodies attack pork as a virus because of how poor of a food source it is (ever seen what pigs eat? ever smell what they live in? they are what they eat…so are we…). How is a natural immune response/immune system attack from our bodies ever validated/justified?

Where does such a thought come from? A quick search didn't bring anything up.