Going to Communion at Mass: What Does It Mean?

Like many Catholics, I've received communion almost as a matter of routine, without thinking much about it. One day, while falling in line to receive communion at mass, a Eucharistic Minister asked me, "Do you believe this is Jesus, your God, that you're about to eat?" I was taken aback for a moment. I was expecting her to say the usual phrase "Body of Christ." I had to think for a moment what to say. Then I realized that this is precisely what we believe as Catholics, that the bread, after being consecrated by the priest, actually becomes Jesus. So it is God that we Catholics eat during communion. Since I do believe this, I said the usual response, "Amen", which means "truly" or "I agree." I'm not sure if what she said was proper, but it did bring to mind this important Catholic belief, which I and many other Catholics, had taken for granted. I guess it's a good thing to be reminded of this key doctrine of our Faith once in a while.