I don't have a source / link handy at the moment, but a couple relevant notes to consider :
1) the vast (vast) majority of corn consumed by humans is processed into things like corn syrup, modified starch, whiskey, etc, rather than eaten "whole" as a grain [like, say, as tortilla chips or whatever], so the notion of broken kernels, etc, scarcely applies to this particular consideration -- see above-linked infographic
2) The question of what type of corn is grown is a really interesting one -- I could rattle on about this for a long time, but suffice to say that the family of varieties generally known as "Corn Belt Dent" [derived at some length from Nothstine and similar early dent corns] is designed to serve both feed / silage and processing-for-human-consumption [including ethanol] purposes. Now, this is not stuff you eat as "corn on the cob" [those are called sweet corns, though back in the day folks used to eat green Corn Belt Dent roasted as "Trucker Ears"], nor is it the same as popcorn [which is its own family, derived at length from flint corns]. There are in fact varieties designed specifically for silage [the common type of feed, where pretty much the entire plant is fermented and fed to animals; these varieties have less fibrous leaves and sometimes more leaves] and grain / processing / ethanol ['floury' types], but it's a matter of choice / market analysis from the farmer's perspective, and ye olde corn belt dent can serve both purposes if need be.
one quick link re : ethanol : https://articles.extension.org/pages/27536/corn-for-biofuel-...