A comparable subject to eating unclean food for us today would probably be consuming alcohol. Paul even mentions wine when talking of moderation, but he goes on to put it in perspective of liberty and judging others for feeling one way or the other. Once again the solution comes back to love. Caring about the impression others get of God through our actions and caring about what our actions may influence them to do. Do you care enough not to exercise your freedom to do something in order win one to or strengthen one in Christ?

Romans 14:1, Romans 14:4, Romans 14:16-18, Romans 14:21 and Romans 14:23