Food - What Can We Eat?

One principle to follow that may involve different actions from the past is that of caring for our physical health. In the beginning, humans were plant eaters, then were given meat. (This was after sin so perhaps it was one of the ways He ensured we wouldn't live forever - meat eaters get really mad at me for considering that as a possibility!) Scripture says everything was fair game.

Later certain meats were considered unclean, unfit for human consumption by the Israelites due to what YHWH told them. Now many people tell me we not only may but even should eat those "meats" now because they are no longer going to make us unclean. Those who say we "should" eat them are those who insist not doing so means I'm trying to earn salvation, I haven't really understood that argument.
Anyway, I don't see why being made righteous in Christ means we can eat unhealthy "meat" that was not considered to be food by the people set apart for blessing as an example from our creator. Jesus said nothing going into the body defiles us, my contention is that it never did. Not spiritually. The whole issue he was discussing was eating with (ceremonially) unwashed hands, it didn't have anything to do with eating poison and staying healthy. Eating poison can kill you but it won't estrange you from your Creator.

I think of pork and shellfish. Shellfish obviously has plenty of problems due to the fact that they are bottom feeders, they don't just collect the garbage, they EAT it. Well. I grew up on the east coast near the ocean, we ate shrimp, crabs, and lobster all the time. Due to pollution I suppose, there are lots of warnings about health hazards now.
Pork - pigs are no longer scavengers in the wild so it's said that it is now fine food to eat. I don't see why that wouldn't be true except that scientific findings about food varies, sometimes as often as week to week, as we learn more. What if there's something about pork that we don't yet know? I choose not to eat it but we still have the issue of all the other meats that were not considered unclean. We have health warnings about mad cow disease, something about veal, on and on. Does that mean we should just all go vegetarian?

But then we have the warnings about germs, viruses, bacteria, and pesticides in our fruits and vegetables. What are we supposed to do, take this literally?:

Then Jesus declared, "I am the bread of life. He who comes to me will never go hungry, and he who believes in me will never be thirsty..."