Black tea is a kind of tea made by full fermentation (fermentation degree greater than 80%). It is made of new buds and leaves of tea trees suitable for making black tea, and is refined through typical processes such as rolling, fermentation, and drying.
Black tea is rich in various vitamins, and the leaf bottom and soup color are red. It has the effects of refreshing the mind, eliminating fatigue, promoting body fluid and clearing heat, and diuresis.
1. Refreshing the mind and relieving fatigue: The caffeine in black tea can stimulate the cerebral cortex and excite the nerve center, thereby refreshing the mind, making thinking more acute, and enhancing memory; black tea can also excite the vascular system and heart, accelerate blood circulation, and promote metabolism.
At the same time, black tea can also promote sweating and diuresis, achieving the effect of eliminating fatigue.
2. Producing body fluid and clearing heat: Drinking black tea in summer can quench thirst and relieve heat. Tea polyphenols, sugars, amino acids, pectin, etc. in black tea can react chemically with saliva, stimulate saliva secretion, and moisturize the mouth; at the same time, caffeine can regulate body temperature and maintain physiological balance in the body.
3. Diuretic: The combined effect of caffeine and aromatic substances in black tea can increase renal blood flow, improve glomerular filtration rate, dilate renal microvessels, inhibit the reabsorption of water by the renal tubules, and promote increased urine output.
4. Strengthen bones: Tea polyphenols in black tea can inhibit the activity of substances that damage bone cells and play a role in strengthening bones.