So, even lusting for a ham and cheese sandwich is a sin?
Kosher dietary regulations were clearly abrogated—with the New Covenant—that is the good news of Jesus Christ, in order to open that good news to Gentiles. The history of how this came about, practically, is found in the New Testament book of Acts.
Biblically educated Christians have not been troubled by diet since the 1st Century—and the writing of the New Testament.
People who try to make an issue of dietary regulations either WANT to cause confusion, or really don’t understand the good news of faith in Christ....or the history of the 1st Century Church at all.