From A New Catholic Commentary on Holy Scripture; Thomas Nelson Publishers……
“Blood was recognized to be the seat of life, and therefore something sacred and reserved to God. Even when not involved in sacrifice, the blood of an animal could not be consumed but must be poured out on the ground (Dt 12:16, etc). The prohibition of blood became one of the dietary laws of the Mosaic code, but because of its inclusion within the provisions of this covenant with Noah the later Jews considered it to be binding on all mankind. Hence the concession made to their feelings in the regulation imposed on Gentile Christians living in a Jewish environment according to Acts 15:20, 29. From this apostolic precedent, the custom of abstaining from blood was observed in some parts of the early Church.” 158b
“……the prohibition of eating blood lasted until the end of the second century (Tert. *Apol. *9:13).” 833i
From the Council of Florence, Session 11 (1442)…
“It firmly believes, professes and teaches that every creature of God is good and nothing is to be rejected if it is received with thanksgiving, because according to the word of the Lord not what goes into the mouth defiles a person, and because the difference in the Mosaic law between clean and unclean foods belongs to ceremonial practices, which have passed away and lost their efficacy with the coming of the gospel. It also declares that the apostolic prohibition, to abstain from what has been sacrificed to idols and from blood and from what is strangled, was suited to that time when a single church was rising from Jews and gentiles, who previously lived with different ceremonies and customs. This was so that the gentiles should have some observances in common with Jews, and occasion would be offered of coming together in one worship and faith of God and a cause of dissension might be removed, since by ancient custom blood and strangled things seemed abominable to Jews, and gentiles could be thought to be returning to idolatry if they ate sacrificial food. In places, however, where the Christian religion has been promulgated to such an extent that no Jew is to be met with and all have joined the church, uniformly practising the same rites and ceremonies of the gospel and believing that to the clean all things are clean, since the cause of that apostolic prohibition has ceased, so its effect has ceased. It condemns, then, no kind of food that human society accepts and nobody at all neither man nor woman, should make a distinction between animals, no matter how they died; although for the health of the body, for the practice of virtue or for the sake of regular and ecclesiastical discipline many things that are not proscribed can and should be omitted, as the apostle says all things are lawful, but not all are helpful.”