http://www.youtube.com/watch?v=jDurZc5Yr6c

An extended clip, 20 minutes worth, from PBS. The short synopsis is that everything most Americans eat is made from corn; such as a burger (corn fed beef), fries (fried in vegetable oil) and a coke (high fructose corn syrup).

The extended story explains that the way our government handles agriculture makes it systemically impossible to make a living from farming.