Food and Drug Administration (FDA) has ruled that the dye is safe. Mountain Dew contains a dye called Yellow No. And even if you did, the effects would only slow sperm motility, not kill your sperm.Īnother theory is that the dye in Mountain Dew affects fertility. You’re probably not drinking this much of the beverage. You would have to drink about eleven 12-ounce cans of Mountain Dew to have a similar effect. So it’s understandable why you may think the caffeine in the drink has the ability to lower or kill sperm.īut given how a cup of coffee has about 217 mg of caffeine per 12 ounces, and you would have to drink 4 cups to cause a decrease in sperm motility, it becomes easier to understand how little Mountain Dew affects sperm. Motility, however, slows down when a male consumes too much caffeine, typically after four cups of coffee a day.Ī 12-ounce can of Mountain Dew contains 54 milligrams (mg) of caffeine, which is more than other sodas (Coke has 34 mg per 12 ounces and Pepsi has 38 mg). A male who drinks one 12-ounce cup of coffee every day may experience higher sperm motility, which is sperm’s ability to move. It’s true that some researchers have found a connection between consuming high doses of caffeine and a change in sperm quality. But the rumor surrounding the drink’s effect on sperm is a myth. If you’re having unprotected sex and unable to conceive, you might point the finger at Mountain Dew, especially if this is your beverage of choice.