Correction: An earlier version of this article mistakenly said scientists in Japan claim the solution to hair loss may be lying in the chemicals used to cook McDonald's french fries. In fact this was an inflated claim. Researchers have found that an ingredient used in the making of McDonald's fries -- in a very small amount -- might also be used as a "culture vessel" in the mass production of hair follicle germs for hair loss treatments. This does not mean that eating fries, which have a very small amount of the chemical Dimethylpolysiloxane, would have any positive impact on your hairline.
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You can read an article explaining the claims and what happened here.