Here's a link to some of things that are outlined in various books of the Bible that are still contentious today.

http://www.truthtree.com/religdrlaura.shtml

I must say I found the writer's take on them amusing.

Pork was essentially shunned initially because pigs can carry diseases humans can catch, notably tuberculosis. It was a health measure for many people to avoid pork. Does that mean that everyone should eat pork because animal husbandry and farming techniques and testing is much improved from 1000's of years ago? No. But it's an interesting discussion point.

BTW I love seafood.