Huang Junhao, an ENT specialist at Taiwan's Dalin Tzu Chi Hospital, collaborated with researchers from Providence University and Taiwan University Hospital to conduct a study involving 265 participants over the age of 55. The results showed that, before adjusting for other factors, the PPS (Pitch Pattern Sequence score for central hearing) of the Oolong tea group was significantly higher than that of the other group.

After excluding factors such as age, gender, waist circumference, smoking, alcohol consumption, coffee drinking, vitamin supplementation, and chronic diseases, the researchers found that the Oolong tea group had a significantly better ability to recognize sounds of different frequencies compared to those who did not drink Oolong tea. The new study also found that long-term consumption of Oolong tea using a purple clay teapot had a more pronounced protective effect on hearing in men than in women. Although drinking Oolong tea has health benefits for hearing, moderation is important. It is recommended to drink 1-2 cups per day.