Generally, loose leaf black tea can stay in the human body for about 3 hours, while the strong tea stays for a long time, so that theophylline accumulates too much in the human body, causing neurological dysfunction. Tea leaves for a long time will not only lose nutrients such as vitamins, but also easily rancid. Even the tannic acid in tea will become a very irritating oxide, which can easily damage the spleen and stomach, especially in summer, it is more likely to cause gastrointestinal inflammation. Below we mainly look at the harm that overnight tea may cause to the body.
What is Overnight Tea
Overnight tea generally refers to soaking for more than 12 hours, or standing overnight, and changes will occur during the placement process. With the increase of soaking time, tea polyphenols and vitamins will gradually disappear, and organic acids will appear in the tea soup. After precipitation, the acidity increases and it deteriorates. A cup of clear turquoise green tea, especially if left at high temperature for a long time, will lose its green color and increase its yellow color. This is the oxidation product of tea polyphenols in tea water, forming yellow-red and red-brown oxidation products, mainly theaflavins, thearubigins and theaflavins. These products are non-toxic and will not harm the human body.
When organic caffeine-free black tea is placed for a long time, a certain chemical reaction will occur between tea polyphenols and vitamins in the tea, because the temperature in the tea will naturally drop after being placed for a long time, and various reactions will occur. happens naturally in the process. As a result, the antioxidant capacity of tea will decrease, and the nutritional value will also decrease. Therefore, from a scientific point of view, we should try to avoid drinking black tea leaves that have been brewed for a long time, and should drink freshly brewed tea, so as to give full play to the value of tea leaves, so that drinking tea can provide us with healthy energy delivery.
Overnight tea may be bad for you
1. Once these oxidizing substances enter the human body, they will also cause inflammation, ulcers, necrosis and other diseases of the kidney, liver and stomach. Therefore, green tea cannot be drunk overnight, and the tea set should be scrubbed frequently.
2. In summer, the temperature is high, and the tea is perishable and smelly. If it is left for more than 24 hours, it is best not to drink it, otherwise it will cause diarrhea.
3. Since flavored black tea is kept for too long, the proteins and sugars in it will continue to breed bacteria and molds, so if it is kept for too long, there may be harmful microorganisms in the tea leaves, which may cause the tea to deteriorate.
