Transubstantiation in Plain English
The question
How can bread still look and taste like bread if it's really become Jesus?
Scripture · Luke 22:19
And he took bread, and when he had given thanks he broke it and gave it to them, saying, "This is my body which is given for you. Do this in remembrance of me."
A short answer
This is the part that makes people squint. It still looks like bread, tastes like bread, would show up as bread under a microscope. So how can Catholics say it's not bread anymore? Are we just ignoring our senses?
Not quite. The Church uses an old but precise word: transubstantiation. The idea is that the deepest reality of the thing, what it actually *is*, changes, while everything our senses pick up stays the same. Jesus said, "This is my body," not "this represents my body" (Luke 22:19). The Church takes him literally because, as we saw in John 6, he insisted on it even when it emptied the room. The Catechism states it directly: "By the consecration the transubstantiation of the bread and wine into the Body and Blood of Christ is brought about" (CCC 1376).
Here's a way to hold it: appearances and reality usually match, but not always. Jesus looked like an ordinary carpenter; he was God. The bread looks ordinary; it's now Christ. We don't believe this because we tested it in a lab. We believe it because of who made the promise. "Let us be assured," the Catechism quotes St. Cyril, "that what seems bread is not bread, though it tastes like it, but the Body of Christ" (CCC 1375). Your senses aren't lying about the appearances. They just can't reach the deepest truth. Faith does. That's the whole thing.