Plant-Derived Sweetener Thaumatin Becomes 1.7 Times Sweeter after Amino Acid Swap (image) Kyoto University Share Print E-Mail Caption Japanese researchers have made a sweeter version of thaumatin, a natural sweetener widely used in "diet" beverages, gummies, and jelly candies. Credit Eiri Ono/Kyoto University Usage Restrictions Please credit Eiri Ono/Kyoto University. Share Print E-Mail 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.