To the best of my knowledge, there have been no references to the Old Testament dietary laws since the Council of Florence,
Cantate Domino, relaxed the prohibitions of Apostolic times.
Unless one hunts, fishes, and grows every morsel of the family diet, it is nigh impossible to avoid kosher/kashrut food. Look at any container on the shelf and it is rare to find one without the myriad symbols of the kosher swindle/tax.