Drinking tea is not only a traditional food culture, but also has a certain effect on scavenging free radicals because tea contains a variety of antioxidant substances and nutrients. Therefore, drinking tea also helps to prevent aging and has a health care effect. Drinking three or two cups of tea every day can prevent aging. Tea contains many vitamins and amino acids. Drinking tea also has certain effects of clearing oil and relieving boredom, enhancing nerve excitement and promoting digestion and diuresis. But the more you drink, the better, and not everyone is suitable for drinking tea. So what are the advantages and disadvantages of drinking tea often?
The benefits of tea
1, which helps to delay aging.
Tea polyphenols have strong oxidation resistance and physiological activity, and are scavengers of human free radicals. According to the research of relevant departments, the effect of 1 mg tea polyphenols on eliminating excessive free radicals harmful to human body is equivalent to 9 micrograms of superoxide dismutase (SOD), which is much higher than other similar substances. Tea polyphenols can block lipid peroxidation and remove active enzymes.
2, help to inhibit cardiovascular disease.
Tea polyphenols play an important role in human fat metabolism. The human body has cardiovascular diseases such as high cholesterol and triglycerides, such as fat deposition on the inner wall of blood vessels and atherosclerotic plaques formed after vascular smooth muscle cells proliferate. Tea polyphenols, especially catechins ECG and EGC in tea polyphenols and its oxidation products theaflavins, are helpful to inhibit this mottled proliferation, reduce the formation of fibrinogen that enhances coagulation viscosity, make coagulation clear, and thus inhibit atherosclerosis.
3. It is helpful to prevent and treat radiation injury.
Tea polyphenols and their oxidation products have the ability to absorb the toxicity of radioactive substances strontium 90 and cobalt 60. According to the clinical trials of relevant medical departments, the treatment of mild radiation sickness caused by radiotherapy with tea extract can reach more than 90%. For cytopenia, the effective rate of tea extract is 865438 0.7%; It has a good therapeutic effect on leukopenia caused by radiation.
4, help to inhibit and resist viruses and bacteria.
Tea polyphenols have strong convergence, obvious inhibition and killing effects on pathogenic bacteria and viruses, and obvious anti-inflammatory and antidiarrheal effects. Many medical units in China have used tea preparations to treat acute and chronic dysentery, amebic dysentery and influenza, and the cure rate is about 90%.
5, contribute to beauty and skin care
Tea polyphenols are water-soluble substances, which can remove facial greasy, astringe pores, sterilize and disinfect, resist skin aging, and reduce the damage of ultraviolet rays in the sun to the skin.
6, help to refresh yourself
Caffeine in tea can stimulate the central nervous system of human body, enhance the excitement process of cerebral cortex, and has the functions of refreshing the brain, clearing away heart fire and calming the nerves.
7, help diuresis to relieve fatigue
Caffeine in tea can stimulate the kidney, promote the rapid excretion of urine, improve the filtration rate of the kidney and reduce the retention time of harmful substances in the kidney. Caffeine can also eliminate excessive lactic acid in urine, which helps to eliminate fatigue as soon as possible.
8, help reduce blood fat and help digestion.
Tea helps digestion and reduce fat, which is to help "lose weight" in modern language. This is because caffeine in tea can increase the secretion of gastric juice, help digestion and enhance the ability to decompose fat. The so-called "long-term eating makes people thin" is here.
9, help to protect teeth and improve eyesight.
The fluorine content in tea is high, and the fluorine content per 100 g of dry tea is 100 mg ~ 15 mg, of which 80% is water soluble. If everyone drinks 10g tea every day, they can absorb 1mg ~ 1.5mg of water-soluble fluoride. Moreover, tea is an alkaline beverage, which can inhibit the reduction of calcium in the human body, help prevent dental caries, protect teeth and strengthen teeth. According to relevant data, the experiment of "gargling with tea after drinking" among primary school students can reduce the incidence of dental caries by 80%. According to the investigation of relevant medical units, 28.6% cataract patients have the habit of drinking tea; 7 1.4% have no habit of drinking tea. This is because vitamin C and other ingredients in tea can reduce the turbidity of eyes, and drinking tea often has a positive effect on reducing eye diseases, protecting eyes and improving vision.
10, improve muscle endurance
Drinking tea can improve muscle endurance, because there is an antioxidant called catechin in tea, which can increase the body's ability to burn fat, improve muscle endurance, help fight fatigue and increase physical exercise time. Drinking green tea is often the most effective.
1 1, improve bone mineral density.
Although tea contains caffeine, it will promote the loss of calcium with urination, but the content is extremely low. Even black tea with high caffeine content is only 30~45 mg per cup. In fact, tea contains more substances that can help reduce calcium loss, including fluorine, phytoestrogens and potassium. A study in Taiwan Province found that people who drink tea regularly have higher bone density and lower probability of hip fracture.
12, drinking tea can maintain the normal acid-base balance of blood. Tea contains alkaloids such as caffeine, theophylline, theobromine and xanthine, and is an excellent alkaline drink. Tea can be quickly absorbed and oxidized during the extraction process, resulting in high concentration of alkaline metabolites, thus neutralizing acidic metabolites in the blood in time.
13, heatstroke prevention and cooling. After drinking hot tea for 9 minutes, the skin temperature drops 1-2 degrees Celsius, which makes people feel cool and dry, while after drinking cold drinks, the skin temperature drops slightly.
14, drinking tea can enhance immune function. Scientists have found that an antibody compound contained in tea also appears in some germ cells, which will help the human body to establish a defense line against germs.
The disadvantages of drinking tea
1, drinking too much tea can cause stomach problems: drinking a lot of strong tea often leads to a lot of physical discomfort, such as dilution of gastric juice and inability to digest normally. A person normally secretes 1.5-2.5 liters of gastric juice every day, which can reasonably digest a person's daily food intake. When drinking a lot of strong tea, it will dilute the gastric juice, reduce the concentration of gastric juice, make the gastric juice unable to digest food normally, and cause indigestion, abdominal distension, abdominal pain and other symptoms, and some even cause duodenal ulcer.
2. Drinking too much tea will hinder the body's absorption of iron: tea contains tannic acid, black tea contains about 5%, and green tea contains about 10%. When people drink a lot of strong tea, the combination of tannic acid and iron will be more active, which will bring obstacles and influence to the absorption of iron and cause iron deficiency anemia.
3. Too much tea can easily lead to constipation: Tannic acid in tea can not only combine with iron, but also with protein in food, producing a large amount of tannic acid protein, which is difficult to digest and absorb, leading to constipation. For the elderly with constipation, constipation will be more serious.
4, drinking too much tea leads to elevated blood pressure and heart failure: caffeine in strong tea can make the human heart beat faster, thus raising blood pressure; At the same time, a large amount of strong tea liquid enters the blood vessels, which can increase the burden on the heart, produce discomfort symptoms such as chest tightness and palpitation, and aggravate the degree of heart failure. Everything is measured. Drinking light tea can keep you healthy, while drinking strong tea is harmful to your health.
5, drinking too much tea will lead to dental caries: strong tea has a high fluorine content, and drinking too strong tea for a long time is easy to cause dental caries, and at the same time, it will make the tooth surface stained with a layer of glaze black.
6, drinking too much tea will affect sleep: because the caffeine content in strong tea is relatively high, drinking strong tea as usual, the accumulation of caffeine will have a strong exciting effect on the entire central nervous system, making the brain in an overexcited state, especially drinking strong tea at night will often seriously affect sleep.
Pay attention to drinking tea
1, tea is seasonal.
Pay attention to the difference between the four seasons, that is, drinking scented tea in spring, green tea in summer, green tea in autumn and black tea in winter. The reason is that people who drink scented tea in spring can emit the cold evil accumulated in the human body all winter, and the rich fragrance can promote the occurrence of human yang. In summer, drinking green tea is better. Green tea tastes bitter and cold, which can clear away heat and relieve summer heat, detoxify and quench thirst, and strengthen the heart. In autumn, drinking green tea is better. This kind of tea is neither too hot nor too cold, which can eliminate residual heat in the body and restore body fluid. Drinking black tea in winter is ideal. Black tea is sweet and warm, rich in protein, which can help digestion, tonify the body and strengthen the body.
Step 2 drink more tea
Pay attention to the amount of tea and drink 2 ~ 6 grams of tea every day. Although tea contains a variety of vitamins and amino acids, drinking tea can relieve boredom, enhance nerve excitement and promote digestion and diuresis, but not the more you drink, the better, and not everyone is suitable for drinking tea. Generally speaking, 65438+ 0-2 times a day, 2-3 grams each time, is more appropriate. It is not suitable for patients with neurasthenia, insomnia, hyperthyroidism, tuberculosis, heart disease, gastropathy and intestinal ulcer, nor for lactation period, pregnant women and infants.
Don't drink too strong tea
Strong tea will make the "excitability" of human body too high, which will have adverse effects on cardiovascular system and nervous system. Patients with cardiovascular diseases may have tachycardia or even arrhythmia after drinking strong tea, which leads to repeated illness.
4. Don't drink tea before going to bed
This is more important for early tea drinkers. After drinking tea before going to bed, it becomes very difficult for many people to fall asleep, which even seriously affects their mental state the next day. People with neurasthenia or insomnia should pay special attention.
5. Don't drink a lot of tea while eating.
Drinking a small amount of tea before or during meals is not a big problem, but if you drink a lot of tea or drink too much tea, it will affect the absorption of many macro elements (such as calcium) and trace elements (such as iron and zinc).
Everything has advantages and disadvantages, so does drinking tea. So don't blindly drink tea, blindly drinking tea will only be counterproductive. Choosing the right amount of tea for your body in a timely manner for a long time is beneficial to your health.