1, refreshing

1) 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;

2) It 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 lactic acid (a substance that makes muscles feel tired) and other old and waste substances in the body, and achieving the effect of eliminating fatigue. ?

2, Jinsheng Qingre

Drinking black tea in summer can quench thirst and relieve summer heat, make the mouth feel moist and produce a cool feeling; At the same time, it stimulates the kidney to promote the excretion of heat and dirt and maintain the physiological balance in the body.

3, diuresis

Under the combined action of caffeine and aromatic substances in black tea, renal blood flow increases, glomerular filtration rate increases, renal microvascular dilates, and renal tubules are inhibited from reabsorption of water, thus contributing to the increase of urine volume. This is beneficial to eliminate lactic acid, uric acid (related to gout), excessive salt (related to hypertension), harmful substances and so on. And relieve edema caused by heart disease or nephritis.

4, anti-inflammatory sterilization

Polyphenols in black tea have anti-inflammatory effects. Experiments show that catechins can combine with unicellular bacteria to coagulate and precipitate protein, thus inhibiting and eliminating pathogenic bacteria.

5, detoxification

Theophylline in black tea can adsorb heavy metals and alkaloids and precipitate and decompose, which is good news for modern people whose drinking water and food are polluted by industry.

6. Strong bones

In order to prevent and treat female osteoporosis, it is suggested to drink a small cup of black tea every day for several years, and the effect is obvious. If lemon is added to black tea, the bones will be strengthened and the effect will be stronger. Various fruits can also be added to black tea, which can play a synergistic role.

7. Anti-aging

American magazines report that black tea has stronger anti-aging effect than garlic, broccoli and carrots.

8, nourishing the stomach and protecting the stomach

Black tea is made by fermentation and baking. Black tea not only won't hurt the stomach, but also nourish it. Drinking black tea with sugar and milk often can diminish inflammation, protect gastric mucosa and have a certain effect on treating ulcers.

9. Relax blood vessels

A study in American medical field is related to black tea. It was found that the vasodilation function of patients with heart disease could be improved from 6% to 10% by drinking 4 cups of black tea every day. After stimulation, the diastolic degree of normal people will increase by 13%.

Extended data:

Precautions:

(1) New tea also contains more caffeine, active alkaloids and various aromatic substances, which will also excite people's central nervous system. Patients with neurasthenia and cardiovascular and cerebrovascular diseases should drink it in moderation, not before going to bed or on an empty stomach.

(2) Don't take medicine with tea; Do not drink tea before and after taking the medicine 1 hour. Ginseng and American ginseng should not be eaten with tea. Avoid drinking strong tea to relieve hangover; It is not advisable to drink tea before meals; Avoid drinking tea immediately after meals; Girls should avoid drinking strong tea.

Baidu encyclopedia-black tea