There is no suggestion in that text that God has made unclean meats suitable for eating. Find me a text which refers to unclean food. You won't find one. There's no such thing. If there was something declared by God to be unclean, them it was never intended to be food. Like swine flesh. It's unclean. Always was. Still is. Therefore not food. Not to be eaten. Nothing to do with voluntary fasting and abstinence of certain foods fire religious purposes. The dietary counsels were established for the good of the people by the Manufacturer. You want to put sugar in your gas tank in your car, go ahead.
Interestingly, all of God's creatures were originally designed to be vegetarians.
Genesis 1:29-30 says...
"And God said, "Behold, I have given you every plant yielding seed that is on the face of all the earth, and every tree with seed in its fruit. You shall have them for food.
30 And to every beast of the earth and to every bird of the heavens and to everything that creeps on the earth, everything that has the breath of life, I have given every green plant for food." And it was so." (ESV)
So the eating of flesh was never in God's original purpose for earth dwellers. Humans only ate fruit provided in the garden of Eden.
But for some reason, not stated in the scriptures, God gave Noah and his family permission to eat the flesh of animals after they had disembarked from the ark. His original instructions to Noah were....
"Go into the ark, you and all your household, for I have seen that you are righteous before me in this generation. Take with you seven pairs of all clean animals, the male and his mate, and a pair of the animals that are not clean, the male and his mate, and seven pairs of the birds of the heavens also, male and female, to keep their offspring alive on the face of all the earth." (Gen 7:1-3)
The "clean" animals before the flood were clean for sacrifice. (not food) and seven of these were taken in to the ark. Three pairs for breeding and one for sacrifice. As for the animals considered "unclean" only one pair were to be taken.
Israel were limited to the eating of clean animals by law, but when Gentiles began to come to Christ, dietary restrictions did not apply to them. Like Sabbath observance and circumcision, it pertained only to Jews....it was not binding on Gentile Christians.
Gen 9:3-6...
"Every moving thing that lives shall be food for you. And as I gave you the green plants, I give you everything. But you shall not eat flesh with its life, that is, its blood. And for your lifeblood I will require a reckoning: from every beast I will require it and from man. From his fellow man I will require a reckoning for the life of man. "Whoever sheds the blood of man, by man shall his blood be shed, for God made man in his own image."
There was at first no restriction on the eating of flesh of
any kind....only the prohibition about consuming blood was stated......but with the law given to Israel, certain classifications were made and the Israelites were to avoid those foods considered "unclean". They developed a revulsion for them.....which explains Peter's reaction to the unclean foods offered to him in a vision. Never had he eaten anything "unclean"....and never would he have entertained such a thing, but God showed him that "unclean" things could become acceptable to God under different circumstances. He was told....
"Stop calling defiled the things God has cleansed.” (Acts 10:10-15) When he was sent to Cornelius he said to those gathered there....
"You yourselves know how unlawful it is for a Jew to associate with or to visit anyone of another nation, but God has shown me that I should not call any person common or unclean."
The Gentiles were considered "unclean" in their worship and practices, so we see when the circumcision issue arose and certain Jews demanded that Gentiles be circumcised, the apostles and older men in Jerusalem declared that the holy spirit had directed them to tell the congregations by letter, that nothing more was demanded of all Christians than the "requirements" they listed......
"For it has seemed good to the Holy Spirit and to us to lay on you no greater burden than these requirements: that you abstain from what has been sacrificed to idols, and from blood, and from what has been strangled, and from sexual immorality. If you keep yourselves from these, you will do well. Farewell." (Acts 15:28-29)
As the Jews were already bound by God's law concerning these things, these requirements pertained mainly to their Gentile brothers. There is no command regarding circumcision, or holding of the Sabbath, or anything else that Jews had to observe.....though there was no prohibition concerning these things either. We are no longer bound by the Law, as Jesus came to fulfill it, and to end it. (Rom 10:4)