We can use 8 hours and 12 hours as nodes. Overnight tea for more than 24 hours has a high probability of mildew, bacteria and mildew, so it is not recommended to drink it; 8 hours to 12 hours, depending on the weather and temperature. Summer 12 hour is also easy to deteriorate, and winter 12 hour is better; Under normal circumstances, overnight tea within 12 hours is not a big problem. Of course, it is certainly not as delicious and nutritious as the newly brewed tea, but the nutritional factors will be reduced, and drinking it will not be harmful to the body.

tea

Tea contains tea polyphenols, vitamins, catechins, amino acids and other ingredients. Antioxidant is one of the important functions of tea. When tea leaves are exposed to the air for a long time, vitamin C is oxidized and tea polyphenols are oxidized into tea pigments, so the antioxidant effect will be weakened, especially for green tea and white tea.

Tannic acid will be produced when tea leaves are left for a long time, and tannic acid will be completely dissolved in tea leaves. Drink it early in the morning and then have breakfast. Tannic acid will react with food to produce oxalic acid. Tannic acid and oxalic acid combine to produce chemical changes, which are easy to produce stones. At the same time, tannic acid also makes other nutrients more difficult to digest.

tea

It is generally recommended that you pour a small cup of boiling water the night before, then cover it, and then add boiling water to warm water to drink the next morning. So when the temperature is not very high, that is, in the normal living environment, can you safely drink overnight water? Such overnight water may also be propagated by microorganisms, but it has little effect on the whole human body. As long as the water is not polluted, the water quality will not change. We suggest not to drink boiled water for more than 24 hours, because the water after 24 hours is easy to be contaminated by bacteria, which is not good for your health.

tea

You may find that tea leaves lose their green color and increase their yellow color after being soaked for a long time, especially in a high temperature environment. This is because the tea polyphenols in tea are oxidized to form yellow-red, reddish-brown oxidation products, mainly theaflavins, thearubigins, theabrownins and so on. These products are non-toxic and do little harm to human body. This change has no distinction between day and night. If the temperature is higher during the day, the change will be greater.