Medical experiments have found that caffeine in black tea stimulates the cerebral cortex, stimulates the nerve center, and promotes the refreshing and concentration of thinking, thus making the thinking response more acute and enhancing memory; It also has an exciting effect on the vascular system and the heart, strengthens the heartbeat, and thus accelerates the blood circulation of metabolism;

At the same time, it promotes sweating and diuresis, thus accelerating the excretion of old and waste substances in the body such as lactic acid (a substance that makes muscles feel tired) and achieving the effect of eliminating fatigue.

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.

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.