Consuming foods and soft drinks that use artificial sweeteners as a sugar substitute may increase a person’s risk for cancer, a study published Thursday by the journal PLOS Medicine found.

Products containing the commonly used artificial sweeteners aspartame and acesulfame-K increased the risk for cancer for those who consumed them by 13%, the data showed.

The risk was even higher for breast cancer specifically, at 22%, and other so-called “obesity-related” cancers such as stomach, liver and colon and rectal cancers, at up to 15%, the researchers said.