Overnight tea water is not recommended.
Not all overnight tea water spoils and triggers reactions such as food poisoning, but since it is difficult to accurately judge by taste, it is not recommended for food safety.
Overnight tea water, if kept in an improper environment and temperature, may cause the harmful bacteria such as Staphylococcus aureus and Escherichia coli in it to exceed the standard, which may cause bacterial food poisoning, leading to nausea, vomiting, abdominal pain, bloating and other adverse reactions.
At the same time, overnight tea water due to contact with the air for a longer period of time, some of the nutrients will oxidize, resulting in a significant loss of nutrients, such as vitamin C, B vitamins and so on. Tea polyphenols and other nutrients exposed to air for a long time in the decline in activity, thus losing its biological function.
Tea water is still recommended to drink now, while trying to avoid drinking strong tea, should not drink a lot of tea water, so as not to cause insomnia and other symptoms.