[nine, overnight tea] especially flavored tea, even if it can not taste the taste, also breed and breed a large number of bacteria. Because the tea contains a lot of protein, most of it does not dissolve in hot water and remains in the leaves. When the water temperature is high, the protein in the tea leaves rotten. After one night, there will be a kind of enzyme and bacteria generation. At the same time, a large amount of tannic acid residue in tea will become a stimulating strong oxide, which causes irritation to the stomach and intestines. It causes inflammation. So, the night tea is not suitable for drinking.
[ten, old people should not drink tea] the so-called raw tea is the dry green green tea which is dried directly without twisting. The shape of this tea is green and green. The contents of this kind of tea are basically the same as those contained in fresh leaves. The low boiling aldehyde alcohol compounds are not converted and volatile, and the aroma with serious green gas. The old people drink this green tea, the irritation of the gastric mucosa is very strong, and it is easy to produce stomach pain after drinking; the young people will also feel discomfort in the stomach after drinking, which is usually said to "scrape the stomach". This kind of raw tea has been purchased by mistake. It is better not to drink directly. It can be put in a non greasy iron pot, stir fry slowly with a fire, baked to produce green gas, and be drinkable after a mild chestnut fragrance.