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These people—who may well include you and me—are eating bread made of air, and so, in a sense, are made of air as well.
Isn't this supposed to be "made from air" because the air is not visible from the product "us."
Like, "This desk is made of wood."・・・This is OK because wood is visible. "Cheese is made from milk"....This is OK because milk is not visible.
But the sentence above goes against this rule. Why?
It's not a requirement that a component be visible to use made of. A penny is made mostly of Zinc even though you can't see it because it's covered with a thin coating of copper.
Made from should be used when the ingredient is altered during the construction. Cheese is made from milk because the milk doesn't stay milk inside the cheese even though one of the inputs to the process is milk.
A desk is made of wood because the wood is still in the form of wood in the finished product.
Your sentence may be an oblique reference to the old adage, "You are what you eat."
