Isn't this either obviously false (yes, corn is in lots of processed foods and oils and most animal feed, but people eat things that don't involve veg. oil, meat, and processed foods all the time) or vacuously true (if we're counting the lining of paper bags, then we should also count plastic made from corn-based ethanol, and trucks that use ethanol in their fuel, and drivers who eat meat which is fed with corn, and we breath air with oxygen produced from corn fields, and...)?