According to historical evidence, tea leaves boiled in water have been consumed in India and China 5,000 years ago from long ago. These two countries were the earliest users of tea. Tea plays a very important role in Japanese social ceremonies as well. In Asian countries, tea has played an important cultural role.
Tea is derived from plant leaves called Camellia sinensis. This factory is cultivated in Asia, the Middle East and Africa.
There are 3 kinds of green, black, oolong tea. These are all derived from Camellia sinensis, the difference being in the way leaves are processed. Green tea is prepared from unfermented leaves. Oolong tea is prepared from partly fermented leaves, and the leaves of black tea are completely fermented. Green tea and oolong tea are mostly consumed in Asian countries such as China, Japan, India, Thailand, but tea is preferred in the United States.
In recent years, green tea has not attracted attention due to its many health benefits due to it. Many studies have been conducted to explore the relationship between green tea intake and the incidence of specific diseases in the population. Green tea is observed to be useful:
- Prevention of cancer,
- & # 39; Good & # 39; (HDL) cholesterol is "bad" cholesterol,
- dementia,
- flatulence treatment,
- glycemic control,
- Adjust body temperature,
- Improve digestion.
In some studies it was suggested that despite ingestion of a fat - rich diet, the low incidence of heart - related diseases in the French population is related to drinking large amounts of green tea by them. This is compared with the low incidence of heart disease in the Japanese population, of which 75% are serious smokers.
The medicinal effect of green tea is due to the presence of polyphenols acting as antioxidants. Antioxidants help to prevent damage caused by free radicals present in the body. Free radicals occur spontaneously, but the number increases due to environmental conditions such as pollution, ultraviolet rays, and tobacco smoke. Green tea contains 30% to 40% polyphenols, and black tea contains up to 10% polyphenols.
3-4 cups of green tea is recommended for adults.
Green tea has been found to be beneficial under the following conditions:
(1) People who drink green tea have low LDL cholesterol level and high HDL cholesterol level. One study done in animals suggests that polyphenols inhibit the absorption of cholesterol from the intestine and help excrete cholesterol in the body.
(2) Ingestion of green tea has not been found to have a low incidence of can in Japan, but in animal experiments it has been shown that polyphenols acting as antioxidants may kill cancer cells.
(3) In one study, polyphenols proved useful for controlling type 1 diabetes. The body stops insulin production with type 1 diabetes. In such a case, green tea helps to regulate the glucose level in the blood.
(4) Green tea has also proved beneficial to the liver. It helps to control the harmful effects of alcohol. People who drink green tea know that the incidence of liver disease is low.
(5) Green tea also helps to reduce the weight of obese people. Although not proved as a conclusion, the weight loss characteristics of polyphenols have been pointed out in several studies.
However, in some cases, you need to pay certain attention while taking green tea.
People with stomach ulcers, heart problems, hyperthyroidism, psychological disorders should not drink green tea. Pregnant women should also be avoided. If you are taking antibiotics, benzodiazepines, beta blockers, blood diluents, chemotherapy, oral contraceptives, lithium, you should also avoid green tea.
