Drinking green tea in moderation on a regular basis does not usually have terrible consequences for the human body, but if consumed in excess, it may affect sleep and so on. Green tea is a common drink in life, 100g of green tea and its main nutrients are energy (1522KJ), protein (34.2g), vitamin C (19.0mg), etc., and also contains calcium (325mg), potassium (1661mg), magnesium (196mg) and other minerals. Regular consumption of green tea, but not in excess, can help the body to maintain various functions, without causing serious consequences for the body. However, because green tea also contains caffeine and other components, if long-term consumption of large quantities, resulting in excessive intake of caffeine, it may stimulate the central nervous system, which will affect the quality of sleep, and may even cause insomnia. It is recommended to drink green tea reasonably and avoid drinking large quantities over a long period of time, which usually does not cause serious effects on the organism.