It’s Time to Rethink America’s Corn System - Scientific American

"Although U.S. corn is a highly productive crop, with typical yields between 140 and 160 bushels per acre, the resulting delivery of food by the corn system is far lower. Today's corn crop is mainly used for biofuels (~40%...) and as animal feed (~36 %, plus distillers grains left over from ethanol production, is fed to cattle, pigs and chickens). Much of the rest is exported.  Only a tiny fraction of the national corn crop is directly used for food for Americans, much of that for high-fructose corn syrup."

https://www.scientificamerican.com/article/time-to-rethink-corn/