What are the benefits and disadvantages of drinking tea

Tea is a natural health drink for most people, the benefits of many, drink properly to quench thirst, eliminate food, phlegm, refreshing, bright eyes, but also to prevent and control a variety of diseases, the reason why it is said to drink properly, because drinking tea also has bad and taboo. Next, let's learn what are the benefits and disadvantages of drinking tea.

The benefits of drinking tea

Cancer prevention

Cancer has now become one of the biggest threats to human health. Tea contains catechins, especially in green tea, accounting for 15% to 20% of the tea. Japanese scientist Shou Hano conducted in vitro experiments on catechins, which proved that catechins and other flavonoids have anti-cancer effects. Tea also contains vitamins C and E, which has an auxiliary anti-cancer effect.

Anti-radiation

Tea contains polyphenols, lipopolysaccharides, vitamin C and carotene, these nutrients combined can absorb the radioactive material strontium, so that it is excreted in the form of feces; the components in tea also have a preventive effect on external radiation damage caused by proton beams, X-rays or gamma rays, thus effectively preventing radioactive material from causing harm to the human body.

Prevention of dental caries

Drinking tea, especially oolong tea, can prevent tooth decay because the fluorine content in oolong tea is high, and the fluorine ion has a great affinity to the calcium of teeth, which is synthesized into a kind of "fluorapatite" that is difficult to dissolve in acid, which is like adding a protective layer to teeth and enhancing the ability of teeth to prevent acid and resist tooth decay. The rate of tooth decay among people who drink oolong tea regularly is 60% lower than that of the general population.

Prevents cardiovascular disease

Drinking tea can reduce the risk of cardiovascular diseases. The main cause of cardiovascular diseases such as hypertension and coronary heart disease is atherosclerosis due to high blood lipids and cholesterol. Drinking tea can effectively reduce blood lipid and cholesterol levels because tea polyphenols can inhibit the proliferation of arterial smooth muscle cells, which obviously have the effect of anticoagulation and promote fibrinolysis, anti-blood plaque formation, reduce capillary fragility and blood viscosity.

Prevent intestinal diseases

Drinking tea regularly is equivalent to drinking a remedy for intestinal diseases. Tea polyphenols in tea can bind with single-celled bacteria, coagulate proteins and kill the bacteria. If the typhoid bacillus, E. coli in a strong tea steeping, most of these bacteria will be inactive. Because the organic acids such as fatty acids and aromatic acids in tea have bactericidal effect.

Sterilization

Some studies have shown that tea has an inhibitory effect on the growth and reproduction of harmful bacteria such as Salmonella, Staphylococcus, Bacillus anthracis, Bacillus subtilis, Bacillus diphtheriae and Bacillus deformans. It is reported that staphylococcus can be extinguished within 14 hours; cholera bacteria can be completely killed within 2 hours. Green tea on the "athlete's foot" foot odor has a very good therapeutic effect, because, thick green tea soup can effectively kill the filamentous bacteria that cause foot odor, every night thick green tea soup soak feet, a period of time can be cured.

Quench thirst and heat

Hot summer drink a cup of tea, you can feel full of mouth, cool all over the body, is a good quencher. Because the polyphenols, sugars, pectin, amino acids in tea is equal to the saliva chemical reaction to moisten the mouth, resulting in a cool feeling, in addition to the caffeine in tea can regulate the body temperature center within the body, thereby regulating body temperature.

Gargle after meals for health

Gargle after meals can remove bad breath, oral inflammation, indigestion, stomach fire hyperactive when a produce bad breath, tea in the aromatic substances have the effect of eliminating bad breath, gargle after meals make the mouth feel fresh, comfortable and not greasy. Alkaline substances in tea can remove dirt, fishy, greasy; tea can also inhibit, kill the usual streptococcus, lactobacillus, E. coli, staphylococcus and other pathogenic bacteria lurking in the mouth; gargle after meals can fight the carcinogenic substances in the mouth, tea tannic acid has anti-cancer effect.

Cure urinary inflammation

Tea contains caffeine, theobromine, theophylline and other diuretic effect, can enhance the heart and kidney function, especially the aminophylline diuretic effect is greater. In the diuretic at the same time, tea has antiseptic and anti-inflammatory congratulations oh ah. So often drink tea can relieve pyelonephritis, cystitis and urinary tract infections.

brighten the eyes

Drinking tea regularly can prevent dry eyes, night blindness, cataracts and vision loss caused by watching TV, thus protecting eyesight. Tea is rich in carotenoids, which can maintain the normal function of epithelial tissue and prevent the appearance of keratinized degeneration and proliferation, which can cause the tear gland cells to keratinize and stop secreting tears, forming dry eyes. Carotene in the body into vitamin A, in the retina and protein synthesis of retinol, can enhance the retinal photoreceptors, so as to prevent night blindness.

Relieve the harm of smoking

Nicotine in tobacco is a highly toxic alkaloid, nicotine with smoke into the body, when the content reaches a certain concentration, it can produce urine poisoning phenomenon, dizziness, dizziness, general discomfort. At this time a cup of strong tea, caffeine in tea can effectively resist the toxicity of nicotine, so that the symptoms are relieved.

Supplementary nutrients

The tea is rich in nutrients. Each 100 grams of tea contains 25.9 grams of protein, 3 grams of fat, 53 grams of carbohydrates, 311 mg of calcium, 360 mg of phosphorus, 39.5 mg of iron, 54.6 mg of carotene, 100 to 500 mg of vitamin C, 10.15 to 0.6 mg of vitamin B, 0.05 to 0.076 mg of folic acid, 5 to 7 mg of niacin, and so on. All these nutrients are essential for human tissues to maintain normal physiological functions. People are less familiar with the element manganese, whose physiological role is no less than that of minerals such as iron and zinc. The human body needs to consume 3.8 grams of manganese from food every day to meet its metabolic needs. Although vegetarian foods such as wheat bran and spinach contain more manganese, the absorption rate is low, while animal liver, kidney and fish foods have a high absorption rate of manganese but less. Tea has quite obvious advantages in manganese supplementation, the manganese content in a cup of strong tea is as high as 1 mg, drink 3 cups a day plus other foods, the human body is not a problem in manganese supplementation.

Fat reduction and weight loss

Caffeine, inositol, folic acid, pantothenic acid and aromatic substances in tea can increase gastric secretion, regulate fat metabolism, reduce blood lipids and cholesterol, all drinking tea can reduce fat and weight loss; oolong tea on protein and fat decomposition effect is particularly obvious.

Refreshing

Drinking tea can speed up the brain, eliminate fatigue and improve work efficiency. Because the caffeine in tea is absorbed by the body, both to excite the central nervous system, so that the mind to stay awake, quick thinking, but also to accelerate blood circulation, active muscles and bones, promote metabolism so that people eliminate fatigue.

Prolong life

Regular consumption of tea can prolong life, including green tea effect is particularly obvious. The tea tannins contained in green tea can control the body's production of hyperacidified lipids to prevent aging. A Japanese scientist compared the effect of vitamin E and tannin on the over-acidification of fatty acids, and concluded that the effect of tea tannin, tea tannin is 19 times the effect of vitamin E. So the anti-aging effect of tea tannins is far better than vitamin E.

Regulation of the thyroid gland

Tea contains the chemical iodine, which is effective in regulating the function of the thyroid gland. This is because iodine deficiency can lead to abnormalities in thyroid secretion, which can lead to malfunctioning of the body's vital activities with serious consequences.

The bad effects of drinking tea

Causes insomnia

Drinking too much tea at one time will lead to nervous excitement, causing insomnia. Because theophylline has a strong diuretic effect, drinking too much tea will lead to frequent night urination; in addition, tea polyphenols have an excitatory effect on the nerves, too strong or too much tea at night will lead to mental overexcitement and affect sleep.

Causes loss of appetite

The tannic acid in strong tea will coagulate protein and vitamin B1, causing the body to be unable to absorb protein and lack of vitamin B1, resulting in loss of appetite, nervousness and fatigue.

Avoid eating with tonic products

In taking ginseng, silver fungus, gum and other tonic if drinking tea, tea in the alkaloids, organic acids and other chemical components will greatly reduce the efficiency of the use of tonic; In addition, when taking Chinese medicine or Western medicine do not use tea compresses, to avoid reducing the effectiveness of the medicine.

Pregnancy risks caused by strong tea

Pregnant women drink strong tea can cause harm to the fetus. Tea contains 2% to 5% caffeine, each 500 ml of strong black tea water contains about 0.06 mg of caffeine, caffeine has an excitatory effect, which will lead to increased fetal movement, and even harm the growth and development of the fetus. Tannic acid in tea can be combined with the iron in food into a complex that can not be absorbed by the body. Pregnant women drink too much black tea type of strong tea will cause awareness of anemia, and even leave the fetus with congenital iron deficiency anemia hidden.

Do not drink it if you have a cold or fever

The theophylline component of tea will raise the body's temperature and intensify fever; in addition, due to the diuretic effect of theophylline, it will promote the discharge of drugs, which may reduce the effect of antipyretic drugs.

Causes stones

The oxalic acid in tea can combine with calcium to produce calcium oxalate that is insoluble in body fluids, which in the long run will lead to stones, so patients with stone disease should be careful with black tea.

Tea drinking contraindications

Drinking too much tea is prohibited, if it is a day to drink a lot of tea, it is easy to lead to the accumulation of tea in the intestines affect the normal activities of the diaphragm, and a lot of tea leads to a large increase in water for the heart pressure burden is also relatively large. Drinking tea forbidden to drink strong tea, drink too strong tea, then it is easy to cause more caffeine is absorbed into the blood, resulting in dizziness, headache, sensory allergies, nervous excitement, and even muscle tremors, heart rhythm disorders, convulsions and other phenomena.

Precautions for drinking tea

Drinking tea should not be consumed on an empty stomach, tea has a stimulating effect on the stomach and intestines, drinking tea on an empty stomach will stimulate the stomach and intestines, which can easily lead to excessive secretion of stomach acid and serious damage to the stomach and intestines. People drunk after drinking tea is easy to increase the burden on the heart, especially in the summer like to drink and eat barbecue people should pay attention to, should not drink tea after drinking, you can eat fruit, small mouthfuls of vinegar and other ways to relieve alcohol.

The best time to drink tea

Morning tea

The first cup is the morning tea, suitable for drinking from 9:00 to 10:00 after breakfast, which can play the role of refreshment, detoxification and anti-fatigue, and is the most important of the 3 cups of tea. Morning tea is most preferable to choose flower tea, flower tea after the second processing, mixed with the richness of flowers and new tea fragrance, can be aromatic wake up the brain, the spirit of the day have a lifting effect.

Afternoon Tea

The second cup is afternoon tea, which is best consumed between 1:00 and 3:00 after lunch or a nap. Afternoon tea can be appropriately strong to lower blood lipids and protect blood vessels. Afternoon tea is generally used green tea, green tea contains polyphenols, with antioxidants, scavenging free radicals, anti-virus and other health functions, suitable for brewing now drink.

Evening tea

The third cup is evening tea, suitable for drinking after dinner from 6:00 to 7:00, which has the effect of lowering blood fat and helping digestion. Black tea is most suitable for drinking at night, because the fermented tea has a low caffeine content, which has little effect on sleep. People with cold constitution can drink more black tea, it warms the middle and drives away the cold, which is more useful for people with cold stomach, cold hands and feet, weakness and love diarrhea. In addition, after 8 p.m. should try not to drink tea.