Generally speaking, tea is made in hot boiled water. In recent years, a new trend of making tea has been developed. In many areas of Japan and South Korea, tea is made in cold water. Green tea, black tea and oolong tea all can be made by cold water. The benefits of making tea in cold water are diverse. 

The first benefit is convenience. In many situations like travelling and climbing, as long as you have mineral spring water or purified water, you can make tea. The tea made by cold water can not only help people stop thirst, but also become rather genuine and fresh. In addition, to make tea by cold water can save a lot of resources including electrical power and coal gas. When you have a meeting, you just need to prepare a bottle of mineral spring water and a bag of instant tea leaves to make tea.

The second benefit is that tea made in cold water can decrease the blood sugar for people. The tea polyphenol contained in tea can effectively reduce blood sugar and prevent such diseases like high blood pressure and cerebral thrombosis for the human body. As a kind of oxidized polymer of tea polyphenol, tea pigment can prevent and treat diabetes to some degree. In addition, tea pigment can also reduce cholesterol and prevent the complicating diseases of diabetes like cardiovascular diseases. If the tea is made in hot water, these beneficial substances can be destroyed seriously. And hot water can cause theine. However, cold water can make the substances play their roles completely.

The third benefit is that such a kind of tea contains abundant nutrients. Generally speaking, tea leaves contain more than 700 kinds of substances. However, many kinds of nutrients can be destroyed in the tea made in hot water. In recent years, the experts have been studying how to maintain the genuine taste and the beneficial substances at the same time. The anti-oxidation effect of tea pigment has been verified. The amount of dissociative tea pigment in cold tea is much higher than that in the tea made in hot water. The unbeneficial substances like caffeine are fewer in the tea made in cold water.

In addition, the tea made in cold water can not affect the human sleep. However, not all the kinds of tea leaves can be used to make tea in cold water. If you want to make tea in cold water, you should choose the kinds of tea leaves which containing low content of phosphorus like green tea and oolong tea. It is convenient and healthy to make tea in cold water by ourselves.