Imagine the scene. Jesus has gathered with his followers in the upper room. He takes the bread, breaks it, and gives thanks. Then he says, "This is my body which is given for you; do this in remembrance of me." Then, in the same way, he takes another loaf and says, "This is my low-carb body which is given for you South Beach dieters." And then he takes another loaf and says, "This is my gluten-free body which is given for you?."

You get the idea.

Over a century ago, many American churches began to abandon the use of fermented wine in communion in favor of grape juice (much to Charles Welch's delight). Today, most evangelicals give little thought to the substitution. It's just the way it is. But last Sunday I was unexpectedly jarred into reconsidering the nature of the communion elements when the bread, and not just the cup, departed from tradition.

I sat down after preaching the sermon and another pastor began to lead the congregation in partaking of the Lord's Supper. He invited people ...