The so-called overnight tea generally refers to tea that has been soaked for more than 12 hours, or has been put on hold for one night.
From the point of view of nutrition and hygiene, vitamins in overnight tea are greatly lost, other nutrients are also reduced, and the content of microorganisms in overnight tea will increase, especially when it is hot every day in summer; Moreover, overnight tea will produce a large amount of free tannic acid, which has a direct stimulating effect on gastric mucosa.
Therefore, whether you can drink overnight tea depends on your physical condition and the deterioration of tea. If the stomach is healthy and the overnight tea has not deteriorated, then the overnight tea can also be drunk. However, from the point of view of nutrition and hygiene, we still advocate instant drinking, and try to avoid drinking overnight tea, let alone drinking deteriorated overnight tea.
Extended data:
Tieguanyin belongs to oolong tea. The best oolong tea is curly, plump, round, thick and even, with sand-green color, and the overall shape is like dragonfly head, snail body and frog leg. After brewing, the soup is golden and rich as amber, with natural and rich orchid fragrance, mellow and sweet taste, and has a long history of returning to Gansu, commonly known as "rhyme". Tieguanyin tea has a high and lasting aroma, which can be described as "seven bubbles are more fragrant".
Oolong tea is between green tea and black tea. Tea is mild, neither too cold nor too hot. It is very suitable for drinking in autumn, which can excite the nerves and make people feel refreshed. When making oolong tea, put more tea, usually 10g, which is about half the volume of the teapot. Boiling water is suitable for brewing. Oolong tea can be brewed for 5~6 times, and the time can be short or long, preferably 2~5 minutes.
People's Network-Overnight tea is actually a good thing.
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China Net-Tieguanyin (Oolong Tea)