Green tea contains more tannic acid, which will combine with iron molecules in food to form a large number of precipitates, which will hinder the absorption of iron molecules by intestinal mucosa. The stronger the green tea is, the greater the obstacle to iron absorption, especially after drinking tea. Therefore, women and people with anemia, even in normal times, drink less strong tea.
Identification method
Pu 'er tea is not as old as possible. Only qualified products will change in the direction of "good" within a certain period of time under suitable storage conditions. If the quality of a tea product is not up to standard at first, or it is improperly stored in the later period, then the quality of the tea product will not be good no matter how long it is kept, and some unscrupulous vendors in the Pu 'er tea market will make a lot of fakes.
The main means of counterfeiting is to accelerate the aging of raw tea through wet storage, make so-called "aged old tea" or make the packaging of tea obsolete to show the sense of obsolescence. It is difficult for ordinary consumers to identify the authenticity and pros and cons of aged Pu 'er tea.
1, tea appearance
The appearance of new Pu 'er tea is fresh, mostly yellow-green, with white fur and strong taste. After a long period of oxidation, the appearance of aged tea will be purple, and the white hair will turn yellow-brown.
2. Color of wrapping paper
Usually, the white paper of aged Pu 'er tea has become obsolete with the passage of time, and the paper is slightly yellow. Therefore, the age of Pu 'er tea can be judged from the aging degree of hand-woven and printed paper. But this can only be used as a reference, not as an absolute basis, because some unscrupulous businessmen may take advantage of this psychology and package secondary products with yellow old wrapping paper.
Refer to the above contents: Baidu Encyclopedia-Pu 'er Tea, Baidu Encyclopedia-Green Tea.