The corn used for ethanol is yellow dent field corn used mostly for animal feed. The spent mash after distillation is still pretty good animal food, so not much lost. We eat sweet corn and white corn.
That being said, it’s still a dumb idea at todays oil prices.
Reason food in the US is cheap is that we eat oil. Oil gets expensive, food gets expensive. And it will.
Sweet corn (yellow, white, bi and tri colored) is mostly eaten from the cob, but is also canned and frozen.