This is truly one of the more interesting HN comments I've read recently. I'm actually surprised how little H goes into a bushel of corn. This really makes the potential future energy tech even more exciting.
Keep in mind that’s for state of the art practices. In much of the world, productivity of food production is an order of magnitude less (corn is pretty much the most productive modern staple crop), and a bushel of corn produces about 6.7 pounds of beef, which is an order of magnitude fewer Calories than the corn you started with. Plus there is food wastage. With inefficient processes, the cost could be two orders of magnitude higher!
So the increase in actual food prices could be far greater than just one cent per day.