I’ve now heard so many version of this, I’m confused.
Growing up, I was taught, you could drink water, but nothing else, within the hour prior to Mass.
But some really knowledgeable Catholics who are really well informed tell me that you can drink any liquid. Our Deacon, last week, brought a cup of coffee (the kind you buy from a shop that comes in a travel cup) into the Sacristy.
What is the rule?
Canon 919 - “One who is to receive the Most Holy Eucharist is to abstain from any food or drink, with the exception of water and medicine, for at least the period of one hour before Holy Communion.”
The rule has two exceptions: First, if a priest celebrates more than one Mass on the same day, as oftentimes happens on Sunday, he is only bound to the one-hour fast before the first Mass. The priest may eat and drink something to keep up his strength in between Masses even though a full hour will not occur before the next reception of Holy Communion.
Second, those who are elderly (at least 60 years of age) or sick as well as their caretakers can receive Communion even if a full hour fast has not been fulfilled.
More importantly, 2 Cor 4:10 reminds us, “Continually we carry about in our bodies the dying of Jesus, so that in our bodies the life of Jesus may be revealed” .
Moreover, the fast before receiving Holy Communion creates a physical hunger and thirst for the Lord, which in turn augments the spiritual hunger and thirst we ought to have.
In a sense, we fast so as not “to spoil our appetite” but to increase it for the sharing of the Paschal banquet. “Blest are they who hunger and thirst for holiness; they shall have their fill” (Mt 5:6). In all, fasting is an exercise of humility, hope and love—essential virtues in preparing ourselves to receive the Holy Eucharist.
This regulation, however, does not mean we have to be scrupulous and count off seconds.
However, we should also not be lax. Pope John Paul II lamented in “Dominicae Cenae” (1980) the problem of some people not being properly disposed to receive Holy Communion, even to the point of being in a state of serious mortal sin.
Therefore, the Eucharistic fast assists us in preparing to receive Holy Communion wholly—body and soul. This physical mortification strengthens our spiritual focus on the Lord, so that we may humbly encounter the divine Savior who offers Himself to us.