It’s no secret that health experts and nutritionists have been wary of high fructose corn syrup for years. But now they have one more reason to advocate against it: a new study published in the journal Science says that the sugary substance boosts the growth of cancerous tumors in mice.

The study, conducted by researchers at Cornell University and Baylor University, found that consuming a modest amount of high-fructose corn syrup every day—about the equivalent of drinking one can of soda—can accelerate the growth of cancerous tumors in mice’s intestines.