Attention wanna-be daddies: Dump your soda! A 2010 Danish study found a link between cola consumption and reduced sperm quality. After tracking the cola intake of 2,554 men, scientists found that those who consumed more than 20 (12-ounce) cans of soda a week (that’s nearly three each day) were more likely to have reduced sperm count, reports a study in the American Journal of Epidemiology. Scientists are not sure what in cola may harm sperm, but it does not appear to be caffeine.