Not Common Bread
Second-century writers speak of Eucharistic bread with striking force. J. N. D. Kelly treats these writers as major evidence for early eucharistic realism, while still allowing development in later doctrine.1
Justin Martyr says Christians do not receive the Eucharist as common bread or common drink. He connects the blessed food with the flesh and blood of Jesus Christ.2
Irenaeus argues against opponents by appealing to bread and cup. The bread, he says, receives the invocation of God and is no longer common bread but Eucharist.3
These are theological claims, not laboratory claims. They do not tell us what bread does to glucose or insulin.
They do tell us what bread had become inside Christian worship. It was no longer only staple food. It was a consecrated sign and participation in Christ.
The distinction matters because it prevents a crude argument. This book is not saying early Christians made a nutrition mistake. They were not trying to write dietary policy.
The claim is historical and cultural. Once bread becomes “not common bread,” later arguments about common bread inherit a sacred shadow.
That shadow does not decide the modern metabolic question. It helps explain why the question feels emotionally and religiously charged, even when the people arguing no longer name the charge.
Related sections: Bread Of Life; Doctrine Around The Loaf.