Diet Soda Sweeteners (IMAGE) University of Southern California Caption Diet soft drinks often use low-calorie sugar substitutes such as stevia and acesulfame potassium, or Ace-K, which might have long-term effects on memory, behavior and metabolic functions. Credit arbyreed Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. Adaptations must be shared under the same terms. License CC BY-NC-SA Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.