1. Fermented tea refers to the general name of tea made by fermentation process in the production process of tea leaves, which is a kind of tea production process. The higher the fermentation process, the less chlorophyll and tea polyphenols, the darker the color and the more mellow the finished tea is.

2. Fermented tea can be divided into light fermented tea, semi-fermented tea, fully fermented tea and post-fermented tea. Among the six major teas in China, white tea and yellow tea are light fermented tea, oolong tea belongs to semi-fermented tea, black tea belongs to fully fermented tea and black tea belongs to post-fermented tea.

3. Tea contains a lot of caffeine, vitamins and other substances, which has a good fat decomposition effect and can reduce the accumulation of fat in the stomach, but the tea polyphenols contained in tea will stimulate the stomach, while the content of tea polyphenols in fermented tea will decrease after fermentation, which will reduce the irritation to the stomach.