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What we have here is progressive revelation, akin to how a parent raises a child. When you tell a child not to play with the chainsaw, you give the child a law. When the child is big enough to use the chainsaw, the law does not pass away, it is fulfilled in the child: he survived the dangers of childhood and now he can use the chainsaw to his benefit. Such were all ceremonial and dietetic laws of Moses, they were given to the Jews in order to help them make the necessary step for holiness, such that produced Mary.

The horror that the introduction of the Eucharistic meal produced among the Jews is palpable in John 6:41-67

41 The Jews therefore murmured at him, because he had said: I am the living bread which came down from heaven. 42 And they said: Is not this Jesus, the son of Joseph, whose father and mother we know? How then saith he, I came down from heaven? 43 Jesus therefore answered, and said to them: Murmur not among yourselves. 44 No man can come to me, except the Father, who hath sent me, draw him; and I will raise him up in the last day. 45 It is written in the prophets: And they shall all be taught of God. Every one that hath heard of the Father, and hath learned, cometh to me.
46 Not that any man hath seen the Father; but he who is of God, he hath seen the Father. 47 Amen, amen I say unto you: He that believeth in me, hath everlasting life. 48 I am the bread of life. 49 Your fathers did eat manna in the desert, and are dead. 50 This is the bread which cometh down from heaven; that if any man eat of it, he may not die. 51 I am the living bread which came down from heaven. 52 If any man eat of this bread, he shall live for ever; and the bread that I will give, is my flesh, for the life of the world. 53 The Jews therefore strove among themselves, saying: How can this man give us his flesh to eat? 54 Then Jesus said to them: Amen, amen I say unto you: Except you eat the flesh of the Son of man, and drink his blood, you shall not have life in you. 55 He that eateth my flesh, and drinketh my blood, hath everlasting life: and I will raise him up in the last day.
56 For my flesh is meat indeed: and my blood is drink indeed. 57 He that eateth my flesh, and drinketh my blood, abideth in me, and I in him. 58 As the living Father hath sent me, and I live by the Father; so he that eateth me, the same also shall live by me. 59 This is the bread that came down from heaven. Not as your fathers did eat manna, and are dead. He that eateth this bread, shall live for ever. 60 These things he said, teaching in the synagogue, in Capharnaum. 61 Many therefore of his disciples, hearing it, said: This saying is hard, and who can hear it? 62 But Jesus, knowing in himself, that his disciples murmured at this, said to them: Doth this scandalize you? 63 If then you shall see the Son of man ascend up where he was before? 64 It is the spirit that quickeneth: the flesh profiteth nothing. The words that I have spoken to you, are spirit and life. 65 But there are some of you that believe not. For Jesus knew from the beginning, who they were that did not believe, and who he was, that would betray him.
66 And he said: Therefore did I say to you, that no man can come to me, unless it be given him by my Father. 67 After this many of his disciples went back; and walked no more with him.

There is, of course, much more to Judaism than diet and ceremony. Jesus strengthened and expanded the moral laws given the Jews and by doing so (see primarily the Sermon on the Mount in Matthew 5-7) He made it law for the Christians.

You can say that Christ is coming for the second time to filfill the law that He gave, although the common way to understand the second coming is public delivery of judgment. As far as the law that the Jews received through Moses it has been fulfilled for the Christians at the Incarnation. There is some debate among the Christians whether or not it has also been fulfilled in the Jews. The Church has not spoken authoritatevely on that. Messianic Jews (i.e. Christians of Jewish origin), as far as I know, either do not obey the laws of kashrut, or if they do, they do it as a mark of ethnic identity rather than a commandment. The Church certainly doesn't ask of the circumcised Jews anything in addition to what it asked of all Christians.