Richard Dawkins claims we should eat lab-grown human meat

[Angrboda]

Does or does not catholicism state that bread and wine become the literal flesh and blood of human being . Which is then consumed ?

..In the physical form of bread and wine. This in no way means we think it is ethical or healthy to eat dead people. The Church is actually against such practice unless in cases of life and death.

Transubstantiation (Latin: transsubstantiatio; Greek: μετουσίωσις metousiosis) is, according to the teachings of the Roman Catholic Church, the change of substance or essence by which the bread and wine offered in the sacrifice of the sacrament of the Eucharist during the Mass, become, in reality, the body and blood of Jesus Christ.

The Roman Catholic Church teaches that in the Eucharistic offering bread and wine are changed into the body and blood of Christ. The reaffirmation of this doctrine was expressed, using the word "transubstantiate", by the Fourth Council of the Lateran in 1215. It was later challenged by various 14th century reformers—John Wycliffe in particular.

The manner in which the change occurs, the Roman Catholic Church teaches, is a mystery: "The signs of bread and wine become, in a way surpassing understanding, the Body and Blood of Christ.":1333 The precise terminology to be used to refer to the nature of the Eucharist, and its theological implications, has a contentious history especially in the Protestant Reformation.

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Council of Trent

In 1551, the Council of Trent confirmed the doctrine of transubstantiation as Catholic dogma, stating that "by the consecration of the bread and wine there takes place a change of the whole substance of the bread into the substance of the body of Christ our Lord and of the whole substance of the wine into the substance of his blood. This change the holy Catholic Church has fittingly and properly called transubstantiation." In its 13th session ending 11 October 1551, the Council defined transubstantiation as "that wonderful and singular conversion of the whole substance of the bread into the Body, and of the whole substance of the wine into the Blood – the species only of the bread and wine remaining – which conversion indeed the Catholic Church most aptly calls Transubstantiation". This council officially approved use of the term "transubstantiation" to express the Catholic Church's teaching on the subject of the conversion of the bread and wine into the body and blood of Christ in the Eucharist, with the aim of safeguarding Christ's presence as a literal truth, while emphasizing the fact that there is no change in the empirical appearances of the bread and wine. It did not however impose the Aristotelian theory of substance and accidents: it spoke only of the species (the appearances), not the philosophical term "accidents", and the word "substance" was in ecclesiastical use for many centuries before Aristotelian philosophy was adopted in the West, as shown for instance by its use in the Nicene Creed which speaks of Christ having the same "οὐσία" (Greek) or "substantia" (Latin) as the Father.

Wikipedia || Transubstantiation