Green tea benefits and bred
Green tea, like other teas derived from the tea tree ( tea or Camellia sinensis ), which is a plant of the genus Camellia of the Tea. The name “Camellia sinensis” you can make the right conclusion that the first tea Bush was cultivated in China. From there he went to Japan, the Dutch then brought him to the island of Java, the British brought in the Himalayas. After that tea has spread in India, Ceylon (now Sri Lanka), Indonesia, and South America.
The difference between green tea more popular his black “brother” is in the handling of the tea leaves. Let’s talk more about how to make green tea.
Technology of production of green tea
Technology of production of green tea consists of the following stages: fixation (steaming), Curling, drying and sorting.
Fixation (steaming) is a processing of tea leaves by steam at a temperature of about 170-180 C (Japanese method) or fried tea leaves in braziers (hemispherical metal boilers, where it is heated to a temperature of about 80-90 C (Chinese method). The purpose of this stage is inactivation (elimination activity) of enzymes and related chemical transformations. Thus, the main feature in the production of green tea lies in the fact that the process of fermentation (oxidation reaction) in it trying to stop, not increase as in the case of black tea. Steam or roast makes tea leaf elastic, making it easy to twist him. After the moisture content of tea leaf will drop to about 60 % stage begins twisting.
The purpose of twisting is a crushing of the tissue sheet, and then on its surface stands out the cell SAP.
After twisting the raw material is sent to drying. There tea gets its olive-green color, and its humidity is less than 5 %. Drying is carried out with hot air at a temperature of about 95-105 C.
Sorting is the final stage of production of green tea, which consists in the grouping of tea, homogeneous appearance (leaf tea, broken tea, baby tea leaves or Fannings).
Important components of green tea
Green tea has in its chemical composition caffeine, which was higher than in natural coffee. The amount of caffeine depends on the correctness of tea production technologies, as well as the initial conditions of growth of the tea Bush. Also green tea contains theobromine and theophylline.
Up to 30% of green tea are polyphenols, in particular catechins . of which the most interesting is the EGCG. Also in this tea tannin is present, the content of which is 2 times higher than its black counterpart.
Vitamins and minerals
In the composition of green tea also contains vitamins (P, C, A, B1, B2, B3, E, etc.) and minerals (calcium, fluorine, iron, iodine, potassium, phosphorus, magnesium, sodium, chromium, manganese, selenium, zinc, etc.).
The benefits of green tea
Green tea has been lots of scientific and medical research, and to this day continues to generate interest in their properties and effects on human health. The results of these studies often contradict each other, but in General about the green tea we can say the following:
Catechins contained in green tea are actively absorbed by the crystalline lens and the retina of the eye, causing oxidative stress in the eyes (the process of damaging the cells due to their oxidation) is reduced by up to 20 hours. The Hong Kong researchers concluded that green tea could be promising in the prevention of glaucoma.
Studies conducted in Slovenia, showed that green tea extract possesses antimicrobial activity.
EGCG helps to protect brain cells. Experience held in Israeli technological University on mice have shown that this type of catechin is struggling with Parkinson’s disease and Alzheimer’s disease.
EGCG laboratory has proven ability to inhibit the growth of cancer cells in prostate cancer. He’s in combination with tamoxifen inhibits the development of breast cancer (the experience in vivo, i.e. in vivo were carried out on mice, the experience of in vitro, i.e. in vitro on human cells).
Green tea reduces the risk of developing disorders of memory and attention in 2 times. The key to this effect, which was confirmed in vivo in humans, perhaps, lies in the ability of EGCG to pass through the blood-brain barrier.
Green tea extract containing polyphenols and caffeine, resumes thermogenesis (heat production by the body) and stimulates fat oxidation. As a consequence, increasing the speed of metabolism. The heart rate stays the same as before. Thanks to such characteristics, the risk of developing heart disease by drinking green tea reduced. And this is confirmed by experience in vivo in humans who have had acute myocardial infarction. When consuming green tea mortality among such people from re-infarction decreased almost 2 times.
In itself, the consumption of green tea reduces the level of cholesterol in the human body (although animal experiments have shown the opposite). However, if you add to the green tea extract theaflavin (the pigment that gives dry welding characteristic luster) contained in the black tea, the level of cholesterol in the human body decreases.
Green tea increases human immunity, and is also energoregulyator (due to the active oxidation of fats).
Regular consumption of green tea leads to normalization of body weight of a person.
Having in its structure a large amount of antioxidants, green tea extract prevents aging of the skin and protects it from ultraviolet radiation.
Despite the lack of scientific evidence that green tea can reduce the risk of development of gastric diseases, and help with existing problems associated with them, folk medicine uses this tea as a remedy for dysentery, stomach disorders, and ascribes to him the ability to get rid of colitis.
Science has not been proven that green tea in any way affects the respiratory disease, but traditional medicine suggests that green tea can treat rhinitis, laryngitis, pharyngitis, stomatitis and conjunctivitis (in the form of rinses and washes). The results of such treatment are unknown.
As for dentistry, green tea contains fluoride, so rinse the teeth and gums green tea is a prophylactic against dental caries.
Thanks to the catechins that reduce oxidative processes in the muscles, green tea helps keep your muscles in tone.
Green tea can reduce the risk of HIV infection. Furthermore, it is able to stop the disease from infected. These studies are only in the initial stage and they are connected with the same type of catechin called EGCG.
Green tea reduces systolic and diastolic blood pressure.
Damage green tea
Excessive consumption of green tea because of its high content of catechins in it can lead to liver disease. Daily intake of catechins – 500 mg. Many weight-loss aid is made on the basis of green tea extract and contain in a single dose of 700 mg of catechins which is dangerous for health.
Also excess consumption of green tea can give complication on the kidneys (green tea contains purines and their derivatives). In addition, because green tea complicates the process of removing uric acid from the body, it is contraindicated for people suffering from rheumatoid arthritis and gout, and various diseases of the kidneys and gallbladder.
Green tea should not be used people with increased nervous excitability.
The existing myths about green tea
Green tea tones and soothes. Green tea or tones, or calms. If brewing green tea in 2 minutes, get tonic, which will give us strength. If you brew it for 5 minutes, you will receive a soothing drink, which relieves stress.
Green tea can be stored in a teapot a day or more. Actually any tea should be drunk per 1 tea ceremony (1 reception). During the day, brewed tea to turn into poison, because the minerals in its composition is completely oxidized.
Harmful to drink green tea with milk. It’s not true. Just by mixing tea with milk there is a change in the composition of the tea. Tannin forms of milk chelate complexes. The tea is just going to be less tonic.
Coffee and green tea contain equal amounts of caffeine. This is not so. Green tea contains more caffeine than any kind of coffee. Partly this is due to the fact that in the course of processing coffee beans lose a large amount of caffeine.
Green tea has hallucinogenic properties. This is pure fiction. Green tea can tone, can relax. But it does not contain substances that can cause hallucinations.