So is grain alcohol. That does not make it plant matter. Both are so far removed from "plants" that the association with it's original components is effectively meaningless. Bread is not a plant product, it is its own thing: a bread product.

Compare the equivalent product, rice. Rice is stewed grass seeds. You don't think it's a plant product? Are potatoes a plant product?

Grain alcohol, depending on how you prepare it, might easily retain no trace of biological material other than sugar and alcohol. That is not true of bread; bread is not heavily processed at all. You could trivially analyze any sample of bread and determine what plants it was made from.

Claiming that bread is not a plant product makes all the sense of claiming that cheese is not a milk product.

So what? Go eat some grass if it's the same.

That is the strategy behind eating oatmeal or rice instead of bread.

Yea. It's still weird as hell to call rice a vegetable as if that's meaningful. Doubly weird to consider rice's vegetable-ness as leading to its carbness.

Most of the rice plant is just fiber, nutritiously.

Fiber is a carbohydrate too, you know. What non-vegetable source of carbohydrates do you know of? As far as I'm aware, human dietary carbohydrates overwhelmingly come from (1) grass; (2) potatoes; (3) fruit; or (4) sugar beets. There is a reason for this: carbohydrate is the basic structural material of plants in the same way that protein is the basic structural material of animals.

I guess you could call honey an animal source of carbohydrates. It's not exactly a huge part of any non-hunter-gatherer's diet. And the bees have to make it from flowers.