Many things, that are sold in grocery stores, i do not consider edible.

Seed oils: soybean oil, corn oil, canola oil, vegetable oil... should not be ingested by humans. They were meant to be engine lubricant.

Battery acid in aluminum cans should not be given to humans as a "tasty drink"

Further, we do not understand our gut biome at all. We do not know what putting too much roughage down or gullet actually does.