How much caffeine there are in green tea? Should I take green tea, what are the precautions to taking green tea?
Green tea comes from the same plant that is used to produce black tea; a leafy bush called Camellia sinensis. There is, however, a small difference between the two teas; The process of fermentation or oxidation varies depending on whether black tea or green tea is to be produced. This process is much milder in the production of green tea and the leaves are oxidized for a shorter time.
Due to the different ways in which the leaves are processed, you will get different teas and different types of caffeine enhancers. We've heard that green tea also contains an amino acid that compensates for the "hyper" effect of caffeine.
Although green tea contains caffeine, it contains less caffeine than black tea, and black tea in turn contains much less caffeine than coffee.
While green tea gives you a small caffeine boost, it creates a softer and more stable source of stimulation that can seem to boost concentration. This combination can also have a calming effect on your brain which helps you must when you want to relax or unwind
WHAT IS GREEN TEA
Green tea is a tea variety from the leaves and buds of Camellia sinensis that has not undergone the same processes of wilting and oxidation as oolong and black teas.  Green tea was originally from China, but its production and manufacturing has expanded to many other Asian countries.
ORIGIN OF GREEN TEA
It is believed that green tea comes from China. A popular legend says that Shennong, Emperor of China and alleged inventor of Chinese medicine, around 2737 BC. Discovered tea as a drink. It sometimes happened that he was sitting outside when fresh tea leaves from a nearby tea tree fell into his cup of boiling water. One may wonder if this can really be considered as "inventing", but it is still a beautiful story till this day though.
Whatever the discovery of green tea, we are very happy. So far, China and Japan are the world's two leading producers and exporters of green tea, but due to its global popularity, it is now grown in many Asian countries.
IS GREEN TEA CAFFEINE FREED?
Although it is a widely held myth that green tea is naturally caffeine free, yet, green tea contains caffeine. And the short answer is that one cup of pure green tea usually contains about 25 milligrams of caffeine per 8 ounce serving. This is considered as a small amount of caffeine though. That's about 1/4 of the amount of caffeine you find in a typical cup of coffee and about half the amount of caffeine you find in a typical cup of black tea.
The most complex answer is that the amount of caffeine in green tea varies from type to type, and green tea may contain between 12 mg caffeine and 75 mg caffeine, with some Matcha teas even more and other green tea powder. There are many factors that affect the caffeine content in tea, including green teas.
PRECAUTIONS TO TAKING GREEN TEA
Green tea contains much less caffeine than regular coffee. But green tea can still cause caffeine-like side effects, much like coffee.
Caffeine can cause insomnia, nervousness and restlessness, stomach upset, nausea and vomiting, increased heart and respiratory rates, and other side effects. Consuming large amounts of it can also cause headaches, anxiety, restlessness, tinnitus and irregular heartbeat.
· Pregnancy and breast-feeding: There is not enough reliable information on the safety of green tea when you are pregnant or nursing. Be careful and avoid it.
· Unusually High Homocysteine Levels: Consumption of a high dose of chlorogenic acid over a short period of time has led to an increase in plasma homocysteine levels, which may be associated with conditions such as heart disease.
· Anxiety Disorders: Caffeine in green tea can make anxiety worse.
· Hemorrhagic Disorders: Some fear that the caffeine in green tea makes bleeding worse.
· Diabetes: Some research suggests that caffeine in green tea may change the way that people with diabetes handle sugar. It has been reported that caffeine causes both an increase and a decrease in blood sugar. Cautiously treat caffeine if you have diabetes and monitor your blood sugar carefully.
· Diarrhea: Green tea contains caffeine. The caffeine in green tea, especially when taken in large quantities, can make diarrhea worse.
· Glaucoma: Intake of caffeine in green tea may increase eye pressure. The increase begins within 30 minutes and lasts at least 90 minutes.
· Hypertension: Intake of caffeine in green tea can increase blood pressure in people with high blood pressure. However, this effect may be less for people who regularly consume caffeine from green tea or other sources.
· High Cholesterol: It has been shown that some components of unfiltered coffee increase cholesterol levels. These components are also contained in green tea. However, it is unclear whether green tea can also lead to increased cholesterol levels.
· Irritable Bowel Syndrome (IBS): Green tea contains caffeine. The caffeine in green tea, especially when taken in large quantities, can make diarrhea worse in some people with IBS.
· Bone dilution (osteoporosis): The caffeine in green tea and other sources can increase the amount of calcium released in the urine. It could weaken the bones. If you have osteoporosis, limit the intake of caffeine to less than 300 mg per day. The intake of calcium supplements can help to compensate for the calcium loss. If you are generally in good health and are taking enough calcium from your food or supplements, taking up to 400 mg of caffeine per day (about 20 cups of green coffee) does not seem to increase the risk of osteoporosis. Postmenopausal women with hereditary disease that prevents them from the normal treatment of vitamin D should be extra cautious when using caffeine.
SHOULD I DRINK GREEN TEA
As regards this question, we can’t give an outright answer for you, but if you are bent or you want to reduce your caffeine intake, green tea is a good choice to go with.