Green tea does contain caffeine. But the amount of caffeine contained within a cup is much lower than that of comparative drinks. For example a can of coca cola has twice the amount of caffeine than a cup of green tea does. Not only this but the manner in which tea is produced sets it apart from other types of tea, such as the traditional cup of English black tea. With black tea the leaves are prepared through a process of fermentation. However green tea leaves are steamed. The difference is the processed means that the leaves are not oxidised. Hence the green tea leaves retain all of their nutritional valu.
Green tea caffeine content depends largely on the size and type of the tea leaf used. That is, the larger the leaf, the less caffeine. Also, the more steeping, the less caffeine you have.
The less green tea you use, the less caffeine content it has. The shape and size of your brewing vessel will also influence caffeine content, that is, the larger thea area of circulation, the more caffeine will be drawn from the green tea leaves.Leaves of green tea plants grown under shade will develop more caffeine in them than those grown in the open.
The highest green tea caffeine levels are found in the top two leaves and a bud, whereas green tea leaves picked from the lower parts of the bush, such as bancha green tea, have much less caffeine content than those picked from the higher parts.Genmaicha, which is half brown rice, will have less caffeine content than one that's all tea.
Green teas that are processed by high firing in a hot wok have less caffeine than those processed more slowly.
The temperature of the brewing water used affects the green tea caffeine extracted from the leaf. One can inadvertently alter the caffeine extraction from the different styles of tea by using water that is either too hot or too cold for the type of tea being brewed. Any such change alters the green tea caffeine content.
The amount of time the tea leaf is allowed to brew also affects the amount of green tea caffeine. This is one of the critical elements of tea brewing. When the tea leaves are steeped longer than five minutes, there may be a reduction in stimulant from the brewed tea. Teas that are infused multiple times release varying amounts of green tea caffeine into the different infusions.
Taking into consideration all of these variables, it becomes clear that definitive statements regarding green tea caffeine are almost impossible to make. One must first know a great deal of information about the source of tea and then adjust for the brewing technique used.
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