God created our bodies and He knows what is good for them and what makes them sick.
Leviticus 11 lists clean animals and those that are SCAVENGERS. We are not to eat scavengers because they FEED on disease. Pigs do not have sweat glands and can not get rid of the toxins that they ingest. Sea creatures such as lobster, crab and shrimp are bottom feeders... what's on the bottom? Toxins.
Our bodies HAVE NOT CHANGED since God created them. What was bad for us when the health laws were issued are STILL bad for us these days.
Some denominations use 1 Timothy 4:4 to justify the eating of scavengers. HOWEVER, the SUBJECT of that chapter is contained in 1 Timothy 4:3...
4:3 "Forbidding to marry, [and commanding] to abstain from meats, which God hath created to be received with thanksgiving of them which believe and know the truth."
God did NOT create scavengers to be received and His orders are set forth in Leviticus 11. Other persons feel that the health laws were vacated by Christ. Did His death on the cross miraculously change our bodies to tollerate scavenger meat and toxins? Not on your life!
Look at Christ's own words in Matthew 5:17-19 (KJV). "17 Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil. 18 For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled. 19 Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven."
NOTHING has changed regarding the law. The only laws that were nailed to the Cross with Christ were the ritual blood sacrifice laws. We are still bound by the 10 Commandments and we are still bound by the statutes, ordinances and laws of Moses. Some denominations have led their followers astray by agenda, but the Word of God is clear regarding law versus grace. If all the old laws were made null and void with Christ's death on the Cross, murder, rape, incest, and a host of other Old Testament Laws would be disregarded these days by everyone and the planet would be in chaos.
Test yourself. Abstain from all that UNCLEAN animal flesh as listed in Leviticus 11 for 6 months. Then go back to your previous menu. I guarantee you that you will feel like a train wreck in-progress as soon as you adopt your old eating habits.