What's in McDonald's Fries?

My friend says that McDonald's makes their fries out of flour. But my other friend says that that is not true, just a rumor that has been going on for a while. Neither of them have a reliable source to back that up, so what does McDonald's make there fries out of, and please give a source with your answers.... show more My friend says that McDonald's makes their fries out of flour. But my other friend says that that is not true, just a rumor that has been going on for a while. Neither of them have a reliable source to back that up, so what does McDonald's make there fries out of, and please give a source with your answers. Thanks in advance! =)
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