This is the case with Mexican Coke versus American Coke. As the name suggests, high-fructose corn syrup is derived from corn, and it contains slightly more fructose sugars than glucose. So when drinkers enjoy Mexican Coke, it may be the toned-down sweetness they prefer. That isn't a problem with glass, which may explain the so-called “cleaner” taste people attribute to Mexican Coke. The Coke from McDonald's has a cult following that that rivals that of Mexican Coke; here's what makes the fast food chain's soda so special.