Overnight tea refers to the tea that stays overnight. In the old days, bad sealing of the container would cause poisonous insects to fall into or climb over, and protein and sugar in the soup would become nutrients for the reproduction of bacteria and molds. Because of too long time, most vitamins have been lost, so it is not suitable for drinking.
However, the overnight tea that has not deteriorated has its own magical use in medical treatment. Overnight tea is rich in acid, which can prevent capillary bleeding, such as stomatitis, tongue pain, eczema, gingival bleeding, sores and abscesses, and can be treated with overnight tea. There is no scientific basis for saying that you can't drink overnight tea.
Extended data:
Overnight tea may be harmful to your health.
1, tea contains tea polyphenols, which are easily oxidized into brown colloid-tea rust in air and water. Tea rust contains many substances such as cadmium, lead, iron, arsenic and mercury. The tea that has not been finished or left in the cup for a long time, such as overnight tea, is exposed to the air for a longer time, and the amount of tea polyphenols oxidized into tea rust is more. Tea rust enters the human body, combines with protein, fat and vitamins in food, and precipitates, which hinders the absorption and digestion of nutrients.
2. Once these oxidants enter the human body, they can also cause inflammation, ulcer, necrosis and other diseases in organs such as kidney, liver and stomach. Therefore, overnight tea should not be drunk, and tea sets should be scrubbed frequently.
3, the summer temperature is high, tea is easy to rancidity and taste, if it is put on hold for more than 24 hours, it is best not to drink, otherwise it will cause diarrhea.
4, overnight tea because of too long, most of the vitamins have been lost, and protein, sugar, etc. in tea have become nutrients for bacteria and mold reproduction, so it is not suitable for drinking.
The above-mentioned overnight tea generally refers to Pu 'er, Longjing, Dahongpao and other relatively strong teas. The doctor suggested that strong tea should not be drunk overnight as far as possible, and it should be filtered twice with boiling water when making tea, mainly because tea was artificially polluted during picking and transportation. For most young people nowadays, they mostly like light plant tea such as chrysanthemum, jasmine and medlar. Drinking this kind of tea overnight will not only do no harm to the body, but will help the body to some extent. Let's focus on the health benefits of this kind of tea.
References:
Baidu encyclopedia-overnight tea