According to a recent report in Japan's Yomiuri Shimbun, a lecturer from the Faculty of Medicine of Tohoku University found that people who drink more than two cups of green tea a day are much less likely to suffer from Alzheimer's disease such as cognitive dysfunction than those who drink less than three cups of green tea a week.
From July to August, 2003, Lishan's research team investigated the lifestyle habits of 70-96-year-old men and women in Sendai/Kloc-0, and then tested their cognitive functions such as memory and graphic depiction.
The results show that people who drink more than 2 cups of green tea a day are less likely to suffer from cognitive impairment than those who drink less than 3 cups, and there is not much difference between those who drink more than 4 cups a day. In this regard, the research team believes that drinking 2 cups a day can see the effect. Li Shan, a lecturer, said that in the future, people who don't drink green tea abroad will be investigated and further studied.
What effect does green tea have on arteriosclerosis, the root cause of heart disease? The production team did the experiment by themselves. Let men who smoke drink green tea four times a day for two weeks. Comparing the blood samples before and after the experiment, it was found that oxidized low density lipoprotein, a risk factor of arteriosclerosis, decreased, and the adhesion of cells such as SP- selectin, which caused the initial reaction of arteriosclerosis, also decreased.
The important risk factors of arteriosclerosis, oxidized -LDL (oxidized low-density cholesterol) and SP-selection, which caused the initial reaction of arteriosclerosis, also decreased.
The higher these values, the easier it is to have oil droplets on the blood vessel wall, and the end of a blood vessel called thrombus is easy to fall off. Thrombosis flows in blood vessels, blocking the cerebral vessels will lead to a stroke. Everyone knows that smoking can easily cause thrombosis and arteriosclerosis, and green tea can prevent this thrombosis and arteriosclerosis.
The production team visited Dr. Takeshima from Osaka City Hospital in Japan. He observed the effect of green tea on blood circulation. It turns out that people who drink green tea have smoother blood circulation than those who drink coffee, just like removing rust from rusty water pipes, the water flow will be smoother.
Coffee doesn't have this effect because it doesn't contain catechin, the essence of green tea. Catechin is a powerful antioxidant, which not only has anti-cancer effect, but also inhibits vascular aging, thus purifying blood. Green tea contains about 15% catechin, and the antioxidant capacity of catechin is 40~ 100 times that of vitamin C.
Green tea is a precious and noble drink. Drinking green tea is a kind of spiritual enjoyment, an aesthetic art behavior and a method of self-cultivation.
There are different opinions about the various beneficial effects of green tea on people's body and mind, ancient and modern, at home and abroad, and Liu's Ten Virtues in Tang Dynasty is more comprehensive. He classified the benefits of drinking tea as follows: drinking tea for health, removing fishy smell, preventing diseases and nourishing qi, dispersing sulks, benefiting people, respecting people, nourishing heart and using tea is feasible.
1. Green tea anti-aging
Antioxidants contained in green tea help to fight aging. Because in the process of human metabolism, if it is over-oxidized, it will produce a lot of free radicals, which are easy to age and cause cell damage. SOD (Superoxide Dismutase) is a kind of free radical scavenger, which can effectively remove excess free radicals and prevent the harm of free radicals to human body. Catechins in green tea can significantly improve SOD activity and scavenge free radicals.
2. Green tea is antibacterial
Studies have shown that catechins in green tea can inhibit some bacteria that cause human diseases without harming the proliferation of beneficial bacteria in the intestine, so green tea has the function of whole intestine. Studies have shown that tea polyphenols can eliminate excessive harmful free radicals in the body, regenerate efficient antioxidant substances such as α-VE, VC, GSH and SOD in the human body, thus protecting and repairing the antioxidant system, which has a significant effect on enhancing immunity, preventing cancer and preventing aging. Drinking green tea for a long time can reduce blood sugar, blood lipid and blood pressure, thus preventing cardiovascular and cerebrovascular diseases. The medical research team of Showa University in Japan diluted 1 ml tea polyphenols solution to 1 of the concentration of ordinary tea, and put it into 10000 highly toxic Escherichia coli 0- 157. Five hours later, all the bacteria died, leaving none.
3. Green tea lowers blood fat
Animal experiments made by scientists show that catechins in tea can reduce total cholesterol, free cholesterol, low-density lipoprotein cholesterol and triglycerides in plasma, and at the same time increase high-density lipoprotein cholesterol. Human experiments show that it can inhibit platelet aggregation and reduce the incidence of arteriosclerosis. Green tea contains flavonol, which has antioxidant effect, prevents thrombosis and platelet aggregation, and reduces cardiovascular diseases.
4. Green tea slimming and fat reduction
Green tea contains theophylline and caffeine, which can activate protein kinase and triglyceride lipolytic enzyme through multiple functions, reduce the accumulation of fat cells, and thus achieve the effect of losing weight.
5. Green tea can prevent dental caries and remove bad breath.
Green tea contains fluorine, in which catechins can inhibit the action of cariogenic bacteria and reduce the occurrence of dental plaque and periodontitis. Tannic acid contained in tea has bactericidal effect, which can prevent food residues from breeding bacteria, so it can effectively prevent bad breath.
6. Green tea can prevent cancer
Green tea can inhibit some cancers, but its principle is limited to the inference stage. Drinking more tea is bound to have a positive encouraging effect on preventing cancer.
7. Whitening and UV protection of green tea
Experts found in animal experiments that catechins in green tea can resist skin cancer caused by UV-B.
8. Green tea can improve indigestion.
Recent research reports show that green tea can help improve indigestion, such as acute diarrhea caused by bacteria, and drinking a little green tea can alleviate the condition.