Why does God say we shouldn't eat Crab & Pork but Jesus says that doesn't really matter

Leviticus 11:7,8 say not to eat pork. Leviticus 11:9 says you can't eat crab / lobster. Jesus says it doesn't matter what you eat. Matthew 15:10,11 NIV: ***Jesus called the crowd to him and said, “Listen and understand. What goes into someone’s mouth does not defile them, but what comes out of their mouth, that is what defiles them.”*** My question is, what is the logic in scripture for this? Why is God explicitly saying we shouldn't eat these things and then Jesus is saying it's not a sin to eat these things really, like I'm really confused on the correlation. Is Jesus suggesting that we *can* eat these things but we *shouldn't*?