Caffeine in black tea stimulates the nerve center by stimulating the cerebral cortex, which promotes the refreshing and concentration of thinking, thus making the thinking response more acute and enhancing memory. Black tea also has an exciting effect on the vascular system and the heart, strengthens the heartbeat, thus accelerating blood circulation to facilitate metabolism, and at the same time promoting sweating and diuresis, thus accelerating the excretion of old waste materials such as lactic acid in the body and achieving the effect of eliminating fatigue.

Black tea originated from Wuyishan tea area in Fujian Province, which has more fermentation processes than green tea, and has to go through withering, rolling, fermentation, drying and other production processes, and belongs to fully fermented tea. The main producing areas are China, Sri Lanka, Indian, Indonesian and Kenyan. Besides Qimen black tea in China, Assam black tea in India, Darjeeling black tea, Ceylon plateau black tea, Nilkiri tea, Chuanhonggongfu and so on.

Extended data

Not suitable for people who drink black tea

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". 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.

People's Network-Black tea has ten health-preserving effects: refreshing, relieving fatigue, promoting fluid production and clearing away heat.

People's Network-What are the effects and taboos of black tea? These people are not fit to drink black tea.