Simply put: In the Quran (the Muslim bible) it is stated:
“Forbidden to you are: dead meat, blood, the flesh of swine, and that on which hath been invoked the name of other than Allah.”
Translation: Don’t eat roadkill (er, anything you come accross that’s already dead), blood, pork, or any animal that wasn’t slaughtered in the name of Allah.
I cannot say one hundred percent why pork is on the “no no” list in Islam as well as Judaism (and some Christian denominations ) but it is believed that because pigs are omnivores who will eat anything including their own poop, they are subject to housing a number of diseases, parasites, and viruses.
Do you get down with the swine? Tell me all about it in a comment below!