Black tea, black tea in English. During the processing of black tea, a chemical reaction centered on the enzymatic oxidation of tea polyphenols took place, and the chemical components in fresh leaves changed greatly. Tea polyphenols decreased by more than 90%, resulting in new components such as theaflavins and thearubigins. Compared with fresh leaves, the aroma substances increased obviously. Therefore, black tea has the characteristics of black tea, red soup, red leaves and glycol. Qimen black tea is the most famous variety of black tea in China and the second largest tea in China.

Explosives that are not suitable for drinking black tea are as follows:

1, stone patients, tumor patients. Patients with stones are generally not allowed to drink black tea.

2, anemia, mental weakness, insomnia. The refreshing effect of black tea will aggravate their insomnia symptoms.

3. People who are usually easily excited or sensitive, have poor sleep and are weak. Because black tea has a good refreshing effect.

4, people with stomach heat. Because black tea is warm tea, it plays a role in warming the stomach.

5. People with thick tongues, people with bad breath, people with acne and people with red eyes. Black tea is "hot", so people who are afraid of getting angry should not drink black tea.

6. People who are taking medicine. Black tea will destroy the efficacy.

7, menstrual women, because menstrual period will consume a lot of iron in the body, tannic acid in black tea will hinder the body's absorption of iron in food.

8. Pregnant women, because caffeine in black tea will increase the load on the heart and kidneys of pregnant women, thus causing discomfort to pregnant women.

9. Lactating women, because tannic acid in black tea affects the blood circulation of the breast, it will inhibit the secretion of milk and affect the quality of breastfeeding.

10, menopausal women, because tea polyphenols in black tea may lead to accelerated heartbeat and poor sleep quality during menopause.

Efficacy:

Black tea can help digestion, stimulate appetite, induce diuresis, eliminate edema and strengthen heart function. Flavonoids rich in black tea can scavenge free radicals, have anti-acidification effect and reduce the incidence of myocardial infarction. Chinese medicine believes that tea is also divided into cold and heat. Green tea, for example, tastes bitter and cold, and is suitable for drinking in summer to cool off the heat. Black tea and Pu 'er tea are warm and suitable for drinking in winter. As for oolong tea and Tieguanyin, they are more neutral.

Black tea can help regulate blood sugar, but it is still inconclusive. In winter, the stomach is easy to feel uncomfortable. People who feel uncomfortable after eating too many iced fruits and vegetables can slowly drink black sugar ginger slices in black tea while it is warm, which has the effect of nourishing the stomach and will feel more comfortable, but it is not recommended to drink iced black tea.