We are allowed by God to eat anything that we want to eat. God does not restrict us from eating anything. Everything that God has created is clean. The Bible says that when God looked what He has created, He saw that everything was good. There is nothing which God created that is not good. So, we are free to eat anything that we want.
The Jewish law which was given by Moses was given by God. That was the law which God gave at that time. He has since abolished that. It was God who instructed Peter to eat what he saw in the trance that God gave him.
Sometimes, we should consider what we want to eat. It is not everything that is good for our health. What is good for another might not be good for another person. We should understand our health reaction to whatever foodstuff that we eat. That is the only reason why we should be selective in what we eat. That is purely personal issues.