You mean the foods that God told Peter to eat in Acts 10? Now I know that vision was about entering the house of a gentile. But along with that would be the foods that Cornelius and other gentiles would be serving. Remember it's not just the animal itself that's clean or unclean, but all the stipulations regarding the preparation, that if not followed make even clean animals unclean. So it seems highly likely Peter was being served and eating unclean animal flesh according to Levitical law - after Peter was told, “Do not call anything unclean that God has made clean.” Acts 10:15
The vision was not about food, but about the gospel being preached to the Gentiles as it was clearly explained.... but it also clearly shows foods were not made clean after the cross after ....it is finished, no changes which reconciles with Revelation 18:2 Isaiah 66:17
Acts 10:17
Now while Peter wondered within himself what this vision which he had seen meant, behold, the men who had been sent from Cornelius had made inquiry for Simon’s house, and stood before the gate. 18 And they called and asked whether Simon, whose surname was Peter, was lodging there.
If it was about food, he wouldn't have wondered what the vision meant . . .
19
While Peter thought about the vision, the Spirit said to him, “Behold, three men are seeking you. 20 Arise therefore, go down and go with them, doubting nothing; for I have sent them.”
44 While Peter was still speaking these words, the Holy Spirit fell upon all those who heard the word. 45 And those of the circumcision who believed were astonished, as many as came with Peter
, because the gift of the Holy Spirit had been poured out on the Gentiles also
I understand its not just about eating clean meats, there are many stimulations- do not eat the fat, do not eat the blood and other good health laws to follow....because God knows what's best for us.