A new study from researchers at China’s Xi’an Jiaotong University provides direct evidence that caffeine alters how taste is perceived. Published in the scientific journal BME Frontiers, the research demonstrates that the presence of caffeine significantly heightens sensitivity to bitter and sour flavors, while having a negligible effect on the perception of sweetness.
The scientific team developed a novel method using lab-grown tastebud organoids derived from stem cells, which functionally mimic human tastebuds. By covering these organoids with 3D electrodes, they created a biometric sensor to measure taste cell activity in real time. The experiment revealed that introducing caffeine tripled the baseline electrical activity of the taste cells, confirming its powerful effect on taste receptors.
These findings carry significant weight for the professional coffee industry, particularly in the context of sensory evaluation. The study suggests that as a taster consumes coffee, the accumulating caffeine could progressively alter their perception, potentially making samples evaluated later in a session seem more bitter or sour. This raises important considerations for standardizing cupping protocols to ensure consistent and accurate assessments across a flight of coffees.