A Professor of Pediatrics at the Indiana University School of Medicine Aaron Carroll wrote the book “The Bad Food Bible: How and Why to Eat Sinfully,” and admits that he hasn’t quit drinking diet soda for a reason. He explains, “There’s a potential -- and likely very real -- harm from consuming sugar. There is likely none from artificial sweeteners.” Still, there have been studies that have found evidence that the artificial sweeteners found in diet soda could potentially cause cancer.