We all know that tea is very good to the health but few people know why tea is good. Caffeine can stimulate the cerebral cortex in the central nervous system to make the mind alert and stimulate the operation of heart, reduce stress, stimulate kidney, help diuretic etc. The contents of caffeine are varied depending on tea variety, season, technical method and part of the tea tree. Caffeine is not changed much during the processing because of its sustainability, and it links with tannin to create tannin caffeine and have comfortable and fragrant taste.
The authors found that the more patients drink tea, the lower the risk of death within 4 years after having heart attack is: the risk of death reduces 28% in the group of patients drinking tea with medium amount and 44% in the group of patients drinking more tea. New researches show that the people drinking tea will be easier to survive after a heart attack than others without drinking tea. Drinking 19 cups of tea per week will reduce 44% risk of death. This effect is due to the antioxidants in tea.