How much caffeine in green tea？

Green tea generally contains 20 mg to 45 mg of caffeine in 100 grams, and can be drunk in moderation in daily life.

Green tea is a common drink, and more types, in daily life, moderate drinking of green tea inside the caffeine will produce excitation of the central nervous system, although the effect of refreshing and waking up, but excessive drinking will lead to these caffeine on the central nervous system stimulation, accompanied by sleep difficulties, usually in the work of the green tea can be moderate drinking, but do not try to drink too much before going to bed.

Caffeine for the body will produce a certain amount of stimulation, if too much intake of the body, will not only cause insomnia, may also be accompanied by symptoms of rapid heartbeat, to stop and then continue to drink green tea, you can drink more warm water, to play the role of dilution.

Green tea is a common tea, which contains rich tea polyphenols, vitamins, caffeine, vitamin A, vitamin E, calcium, potassium and caffeine, etc., each cup of green tea caffeine is about 10-80 mg. Appropriate to drink some green tea on the body has certain benefits, can alleviate the situation of thirst, and at the same time, caffeine and theophylline in the green tea have diuretic effect, which can help to increase the amount of urine, prompting the urinary discharge. In addition, the caffeine in green tea can also excite the central nervous system, which can slow down fatigue. It is recommended to control the intake of green tea, because green tea may cause irritation to the gastric mucosa, and if you drink green tea in excess, it may lead to stomach discomfort.

It is recommended to put less tea leaves when brewing green tea, avoid drinking too strong green tea, and avoid drinking green tea on an empty stomach, so as not to cause gastric discomfort or affect the body's absorption of protein.
A daily caffeine intake of less than 200 milligrams does not usually cause severe anxiety. If the green tea is more than 3 cups (700~800ml) then it may cause rapid heartbeat, anxiety and nervousness.

Since green tea contains caffeine, which has an excitatory effect on the vegetative nerves, excessive intake may affect the sleep cycle.