By Priyanjana Pramanik, MSc. Reviewed by Susha Cheriyedath, M.Sc. Sep 2 2025 Researchers found that raspberry leaf tea significantly reduced early postprandial glucose and insulin spikes when consumed with sucrose, but not glucose, in healthy adults. The effect is linked to ellagic acid–rich polyphenols that inhibit carbohydrate-digesting enzymes. Study: Effects of Raspberry Leaf Tea Polyphenols on Postprandial Glucose and Insulin Responses in Healthy Adults . Image Credit: Evgrafova Svetlana /