[erehweb]

See below, from https://thejesuitpost.org/2023/04/catholic-101-transubstanti... This seems clear enough to me, and can be summed up by saying that Catholics believe that they are literally eating the body of Christ.

... “transubstantiation” refers to a change in which the substance of a thing—what it really is—changes, while its physical characteristics do not. Of course, this sort of change only occurs in the Eucharist, which, though it appears to remain bread and wine throughout the Mass, nevertheless truly becomes the flesh and blood of Jesus.

[russnewcomer]

I took your using the word literally to mean you were saying that the physical characteristics changed, which is apparently not what you were saying.

I think this is a difference in language expectations, because when and where I grew up, some Protestants thought that Catholics believed either that the physical characteristics of the Eucharist changed during the blessing or consumption of the Eucharist, which your link seems to demonstrate to me that you are not agreeing with.