Overnight tea will produce tea polyphenols, which will darken the color of tea leaves after oxidation, and then form tea rust on tea sets, which is also bad for people's health.
In addition, overnight tea also has the problem of nitrite, which is similar to overnight meal. However, the content of nitrite in tea is too low to affect people's health. When tea leaves are left for a long time, some shiny things will be produced on the surface, not heavy metals, but polyphenols after oxidation.
It is worth mentioning that there are many stresses in drinking tea, such as green tea, which is generally not recommended to be preserved for too long, because the nutrients such as tea polyphenols, amino acids and tea polysaccharides in green tea will slowly ooze out within 1 hour. If it takes too long, these nutrients will be lost.
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/health.people.com.cn/n1/2016/108/c404177-28844573.html "target =" _ blank "title =" People's Network. People's network-three misunderstandings about drinking tea. How many tricks do you have?