Like any sugary beverage, Mountain Dew is bad in large amounts or with frequent consumption. Mountain Dew contained the controversial additive brominated vegetable oil, but the additive was discontinued in May 5, 2014.
Another Mountain Dew ingredient, tartrazine, was rumored to lower sperm count, but no scientific evidence of a connection was ever found. For people who drink one or more cans of soda a day, the risk of developing type 2 diabetes increases 26 percent, according to studies published by the U.S. National Library of Medicine. Other studies involving the link between sugar-sweetened beverages and coronary heart disease show a 20 percent difference between those who consumed them regularly and those that consumed rarely.