Since alien won´t answer the question about pork, I will try to explain a little bit.

When alien genetic scientists designed the current human prototype, they inserted many DNA codes and commands designed to imprison the true nature of this spiritual path. In this design many animal code sequences were inserted, and humans happen to contain many "pig" segments of DNA. Much like livestock, alien overlords wish to feed their "stock" the foods that will best suit their needs.

Basically, if you feed a cow beef it will not taste very good.