Why would an all-knowing God make (healthy) dietary laws and then tell His Son to go and change that? Did He change His mind about pork chops?
Col 2:14 Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross;
Col 2:15 And having spoiled principalities and powers, he made a shew of them openly, triumphing over them in it.
Col 2:16 Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days:
Col 2:17 Which are a shadow of things to come; but the body is of Christ.
1Ti 4:1 Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils;
1Ti 4:2 Speaking lies in hypocrisy; having their conscience seared with a hot iron;
1Ti 4:3 Forbidding to marry, and commanding to abstain from meats, which God hath created to be received with thanksgiving of them which believe and know the truth.
1Ti 4:4 For every creature of God is good, and nothing to be refused, if it be received with thanksgiving:
1Ti 4:5 For it is sanctified by the word of God and prayer.
The answer is in this last verse,for it is sanctified by the word of God and prayer,it is spiritual in the New Testament.
The Old Testament had the moral laws,laws of love,given to them,but nobody could live up to them to be spiritually right with God,so it is basically a physical covenant with physical blessings,physical laws,and if their sins were covered by the blood of animals,when Christ shed His blood it washed away their sins,and then they became spiritual.
So God had physical laws for them in the Old Testament,which means since it was not spiritual it did not cleanse certain animals for them to be able to eat,because the Spirit was not working among them in the same capacity that the Spirit works in the New Testament.
In the New Testament it is spiritual,so we can eat what we want,for it can be cleansed,for it is sanctified by the word of God and prayer,where it could not be cleansed like that in the Old Testament.
The same with all the physical ordinances of Israel,since it is spiritual now they do not apply anymore.