First, let's look at these commonly consumed teas: Green tea is basically a natural tea that has not undergone roasting, maintaining the green color of the original plant, so green tea is cooling in nature; red signifies warmth, so black tea is warming in nature as it has been processed; oolong is a semi-roasted tea, with the outer layer similar to black tea, but when opened, the inside is green. Its nature is between black tea and green tea, making it neutral; flower tea, as the name suggests, is processed based on tea's ability to absorb the aroma of other flowers. Therefore, flower teas have different names depending on the flower used. The most common is jasmine tea, and there are also rose tea, osmanthus tea, etc. Whether a flower tea is cooling or warming depends on whether the base tea used is green tea or black tea.

So ultimately, tea essentially falls into three categories: green tea, black tea, and oolong tea. Whether these three types of tea are good or bad for you depends on your body constitution type, due to their different cold and hot natures. From my personal perspective, I believe tea drinking should be moderate. Drinking too much tea is like over-consuming one type of food, creating an imbalance.

We can see that many people with Yang deficiency constitution developed it from drinking green tea. Drinking green tea over a long period can lead to deficiency-cold syndrome. If you are already accustomed to drinking tea, I recommend drinking oolong tea, which is what I figured out for myself. If I drink several cups of green tea in the morning, by around 11 am, I experience heart palpitations, shortness of breath, and hand tremors. If I drink black tea all morning, my throat starts to feel uncomfortable. Finally, I discovered that drinking oolong tea satisfies my desire for tea without causing any discomfort, because its nature is relatively balanced.