How does transubstantiation account for the amount of Christ's body eaten over the last 2000 years?

If whenever communion occurs the bread and wine literally become Christ's body and blood then how is there enough of Christ's body to last for undoubtedly thousands of communion events every day for the past 2000 years? That would be millions of pounds of bread and wine over time. How is this explained in the transubstantiation belief system? I assume somebody has had to have wondered this before. Is it explained away by saying that the bread isn't *really* the body, but it *really* is? Does God just perform a miracle and allow Christ's body to become theoretically infinite in mass?