Black tea can help regulate blood sugar, but it is still inconclusive. People who feel uncomfortable after eating too many iced fruits and vegetables in winter can add brown sugar and ginger slices to black tea and drink it slowly while it is warm, which will nourish the stomach and make them feel more comfortable, but it is not recommended to drink iced black tea.
Refreshing and relieving fatigue
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; 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, so as to accelerate the excretion of old and waste substances such as lactic acid (a substance that makes muscles feel tired) in the body and achieve the effect of eliminating fatigue.
Promoting fluid production and clearing away heat
Drinking black tea in summer can quench thirst and relieve summer heat, because polyphenols, sugars, amino acids and pectin in tea react with saliva to stimulate saliva secretion and make the mouth feel moist and cool. At the same time, caffeine controls the temperature center of hypothalamus and regulates body temperature. It also stimulates the kidneys to promote the excretion of heat and dirt and maintain the physiological balance in the body.
be diuretic
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.
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. Therefore, for patients with bacillary dysentery and food poisoning, drinking black tea is quite beneficial. People often use strong tea to smear wounds, bedsores and athlete's foot.
Detoxify
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.
Strong bones
On May 13, 2002, the American Medical Association published a survey of 497 men and 540 women in recent years, pointing out that people who drink black tea have strong bones, and polyphenols in black tea (also in green tea) have the activity of inhibiting substances that destroy bone cells. 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.
Anti-wrinkle
In the past five years, the US government has funded more than 65,438+050 studies on green tea and black tea and their chemical compositions. The results show that antioxidants in green tea and black tea can completely destroy the transmission path of chemicals in cancer cells. Murray, director of vascular epidemiology at Beth Israel Deaconess Medical Center in Boston? Dr. Mitelman said: "The efficacy of black tea and green tea is roughly the same, but the antioxidant composition of black tea is much more complicated than that of green tea, especially beneficial to the heart." . American magazines report that black tea has stronger anti-aging effect than garlic, broccoli and carrots.
Nourishing and protecting stomach
When people drink green tea instead of eating, they will feel sick to their stomachs. This is because tea polyphenols, an important substance contained in tea, have astringent taste and have a certain stimulating effect on the stomach, especially on an empty stomach. Black tea is different. It 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.
Diastolic blood vessel
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%.