Nutrition Facts
Black tea is rich in carotene, vitamin A, calcium, phosphorus, magnesium, potassium, caffeine, isoleucine, leucine, lysine, glutamic acid, alanine, aspartate and other nutrients. During the fermentation process of black tea, the chemical composition of fresh leaves changes greatly due to the chemical reaction of polyphenols, which will produce theaflavins, thearubin and other components. Its aroma is significantly increased than that of fresh leaves, forming the unique color, aroma and taste of black tea.
Main effect
Studies have shown that black tea has the effects of assisting in lowering blood sugar, blood pressure and blood lipids. The tea pigment in black tea has antioxidant, anti-tumor, anti-inflammatory and bacteriostatic, anti-mutation, anti-virus, and deodorizing effects. [15]
Black tea can help gastrointestinal digestion, promote appetite, diuretic, eliminate edema, and strengthen heart function. Black tea “is rich in flavonoids that can eliminate free radicals, have anti-acidification effects, and reduce the incidence of myocardial infarction. Traditional Chinese medicine believes that tea is also divided into cold and hot. For example, green tea is bitter and cold, suitable for drinking in summer (depending on personal physique), for cooling off heat; black tea and Pu’er tea are warmer and more suitable for drinking in winter. As for oolong tea, Tieguanyin, etc. are more neutral.
Black tea can assist in blood sugar regulation, but there is still no definite conclusion. In winter, the stomach is easy to feel uncomfortable, and people who feel uncomfortable eating too many iced melons and fruits can add brown sugar and ginger slices to black tea, and drink it slowly while it is warm. It has the effect of nourishing the stomach and will make the body more comfortable, but it is not recommended to drink iced black tea.
refreshed
The caffeine in black tea stimulates the cerebral cortex to excite the nerve center, promoting refreshing and thinking, which in turn makes the thinking response more acute and the memory enhanced; it also excites the vascular system and the heart, strengthening the heartbeat, thereby speeding up blood circulation to facilitate metabolism, and at the same time promoting sweating and diuretics, thereby accelerating the excretion of lactic acid (a substance that makes muscles feel tired) and other waste substances in the body, achieving the effect of eliminating fatigue. [6]
Shengjin clearing heat
Drinking black tea in summer can quench thirst and relieve heat because the polyphenols, amino acids, pectin, etc. in the tea react chemically with the mouth and saliva, and stimulate saliva secretion, causing the mouth to feel moisturized and cool; at the same time, caffeine controls the body temperature center of the hypothalamus, regulates body temperature, and also stimulates the kidneys to promote the excretion of heat and dirt, maintaining physiological balance in the body.
diuretic
Under the combined action of caffeine and aromatic substances in black tea, it increases the blood flow of the kidneys, improves the filtration rate of the glomeruli, dilates the renal microvessels, and inhibits the reabsorption of water by the renal tubules, thus contributing to the increase in urine output. This is conducive to eliminating lactic acid, uric acid (related to gout), excessive salt (related to hypertension), harmful substances, etc. in the body, and alleviating edema caused by heart disease or nephritis.
anti-inflammatory sterilization
The polyphenols in black tea have anti-inflammatory effects. Experiments have found that catechins can bind to single-celled bacteria to coagulate and precipitate proteins, thereby inhibiting and eliminating pathogenic bacteria. Therefore, it is beneficial for patients with bacterial dysentery and food poisoning to drink black tea, and strong tea is often used in folk to apply to wounds, bedsores and Hong Kong feet.
detoxification
The polyalkaloids in black tea can adsorb heavy metals and alkaloids and precipitate and decompose, which is a blessing 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 over 10 years, pointing out that people who drink black tea have strong bones, and the polyphenols in black tea (also found in green tea) have the vitality to inhibit the destruction of bone cells. In order to prevent and treat common osteoporosis in women, it is recommended to take a small cup of black tea every day, and the effect will be obvious for several years. For example, adding lemon to black tea can strengthen bones and have a stronger effect. In black tea, various fruits can also be added, which can play a synergistic role. [6]
anti-aging
In the past five years, the US government has funded more than 150 studies on green and black teas and their chemical components, and the results show that the antioxidants in green and black teas can completely disrupt the transmission path of chemicals in cancer cells. “Black tea is roughly equivalent to green tea, but the antioxidants in black tea are much more complex than green tea, especially for the heart,” said Dr. Murray Mittelman, director of vascular epidemiology at Beth Israel Deaconess Medical Center in Boston. The American magazine reported that black tea has stronger anti-aging effects than garlic head, broccoli and carrots.
Nourish the stomach and protect the stomach
When people drink green tea without eating, they will feel uncomfortable in the stomach. This is because the important substances contained in tea leaves – tea polyphenols have astringent properties and have a certain stimulating effect on the stomach. In the case of an empty stomach, the irritation is stronger. Black tea is different. It is fermented and baked. Black tea not only does not hurt the stomach, but can nourish the stomach. Regular drinking of black tea with sugar and milk can reduce inflammation, protect the gastric mucosa, and have a certain effect on treating ulcers.
diastolic blood vessels
A study in the American medical community was related to black tea. The study found that patients with heart disease who drank 4 cups of black tea a day could increase their vasodilation from 6% to 10%. Ordinary people who were stimulated increased their vasodilation by 13%. [6]
Black tea taboo
- Stone patients and people with tumors. Stone patients are generally not allowed to drink black tea.
- People with anemia, mental weakness and insomnia. The refreshing effect of black tea will make their insomnia symptoms worse.
- People who are usually emotional or sensitive, have poor sleep and are weak. Because black tea has a good refreshing effect.
- People with a hot stomach. Because black tea is a warm tea, it plays a role in warming the stomach.
- Thick tongue coating [7], bad breath, acne-prone, and people with red eyes. Black tea is “hot”, and people who are afraid of getting angry should not drink black tea.
- People who are taking medicine. Black tea will destroy the effectiveness of the medicine.
- For menstruating women, because menstruation consumes a lot of iron in the body, the tannic acid in black tea can hinder the body’s absorption of iron from food.
- During pregnancy, caffeine in black tea can increase the load on the heart and kidneys of pregnant women, causing them discomfort.
- For breastfeeding women, because the tannic acid in black tea affects the blood circulation of the breast, it can inhibit the secretion of milk and affect the quality of breastfeeding.
- Menopausal women, because the tea polyphenols in black tea may cause menopause to experience rapid heartbeat and poor sleep quality.