Mateo, There is one fundamental question about the Eucharist that I have long been searching for a satisfying answer for. The usual answer is that we also drink his blood when we eat his body. As an orthodox Roman Catholic, I believe that. But it doesn't answer my question. A nun told me that it's economics.
Wine is expensive.
I hope you can give a good answer so I can rest from this question. We eat Christ's flesh and drink his blood, really, truly and substantially present under the appearances only of bread and wine. This Eucharistic faith is central and essential to Catholicism, and if any Catholics doubt or deny it, I assure you they will not remain Catholics very long, except perhaps in name only. According to J.J. Megivern in the New Catholic Encyclopedia, vol. 44-46, in the early Church, host and cup were ordinarily both received.