What makes bread bread?

[RomanCatholic567]

I know that during the consecration in the Mass, the bread and wine is changed into the Body and Blood of Christ, even though the accidents of bread and wine remain, so that the substance changes from bread and wine to the Body and Blood of Christ. But my question is this: what does it mean for something to have the substance of bread? Or in other words, what makes bread bread? I know that the substance of a human being is the soul of that human being, so that a dead body does not have the substance of that person because their soul is not there. But what does it mean for something to have the substance of bread (or any nonliving thing), if it’s not chemical composition (since the consecrated Host retains the chemical composition of bread but is not bread)?

 

[JerryZ]

Well bread has been one of the staple foods of humanity since man discovered that by grinding some grass seeds flour could be obtained.
So to your question the main ingredients of bread are:
Wheat flour and water. Also heat can be declared to be an ingredient since it converts what is basically glue into edible bread.
Throughout time other ingredients have been added to improve texture and flavor like salt, oil, some seeds etc.
But the key ingredients are the 2 mentioned above.
Peace!

 

[John_Martin]

I find my body eating “bread substance” and I KNOW my body is uniting material nutrients into its structures.
I find my body consuming “body and blood of Christ substances” and I KNOW my body is now the place where the resurrection of Christ can be found; “I have been crucified with Him, buried with Him into death when the pastor baptized me; it is not I writing this, but Christ raised in me.”

You understand a “substance” correctly when what you KNOW of it is what it really does to you being united to it as one into you (you are an individual substance).