Induce disease. As we all know, tea should be brewed with boiling water at 70-80℃. However, for convenience, many people like to make tea in a thermos cup so that they can carry it with them and have hot tea to drink at any time.
I don't know that this will not only destroy the nutrients in tea, but also leach a lot of tannic acid and theophylline, increasing harmful substances. Long-term drinking will be harmful to health, leading to digestive, cardiovascular, neurological and hematopoietic diseases.
Affect the taste of tea. The temperature of the thermos cup is relatively high. If the tea leaves are soaked at this temperature for a long time, the nutrients of the tea leaves will disappear, and the tea polyphenols, tannins and other substances contained in the tea leaves will be leached in large quantities, making the tea leaves rich in color and bitter, so it is not suitable to make tea in a thermos cup.
The biggest feature of extended data thermos is heat preservation. In other words, the tea leaves in the thermos cup are soaked in high-temperature and constant-temperature water for a long time, which is a bit like stewing meat in a braised pot.
Tea is rich in various nutrients, such as vitamins and minerals, as well as pharmacological components such as tea polyphenols, caffeine and tannins. However, these nutrients are afraid of continuous high temperature, and tea leaves are soaked in high-temperature water for a long time, and the color of tea leaves is thicker and bitter.
Aromatic substances in tea will accelerate volatilization, tea soup will lose its proper aroma, and tannic acid and theophylline will easily seep out in large quantities, reducing its nutritional value. However, when the temperature exceeds 80℃, a large amount of vitamin C will be lost, and the health care function of tea will be reduced accordingly.
People's Daily Online-Is it harmful to make tea in ordinary thermos cups? What cup is good for making tea?