Pork. why do you chose not to eat it personally?
Pork is for another reason... the biochemicals in pork are the closest match to human tissue which is why they're used for heart valves, insulin, etc. As such I think that they might be more likely to cause immune problems such as autoimmunity etc. Bacon, is packed with nitrites as a preservative which have been shown to cause cancer. It is hard to find but there is bacon that is nitrite free, but a better alternative is nitrite free turkey bacon.