There’s a documentary “King Corn” that talks about how US government subsidies to farmers for growing corn have made it so inexpensive that it creates a surplus and prices that are too low relative to other foods. This resulted in the proliferation of corn being fed to cattle and other animals, which makes them less healthy to eat but fattens them for slaughter sooner. Also corn syrup is so cheap to make it made soft drinks less expensive. These are large reasons why fast food was so inexpensive and so bad for you. Also surplus corn and corn syrup led to the creation of a lot of unhealthy breakfast cereals which are marketed to kids.