1. Milk soy milk
The premise of pouring the heated milk and soy milk directly into the thermos is that they must be consumed within a short period of time. This is because the microorganisms in milk and soy milk will multiply at a suitable temperature, which will cause the drink to deteriorate, and it will easily cause abdominal pain, diarrhea and other gastrointestinal symptoms after drinking.
In addition, after the thermos cup is filled with milk or soy milk once, the cup will smell of milk and soy milk for a long time, and it will be easy to smell when it is filled with other drinks. Furthermore, in a high temperature environment, the acidic substance of the milk will react chemically with the inner wall of the thermos, which affects human health.
2. Drinks with strong acidity
Insulation cups are mostly made of stainless steel. Stainless steel is most afraid of strong acid. If you store drinks with strong acidity for a long time, heavy metals such as chromium and nickel contained in stainless steel are easily precipitated due to chemical reactions and enter the drinks. Our respiratory system, digestive system, etc. pose a threat.
Friends who love tea usually brew tea with a thermos cup to keep the temperature of the tea. But this approach is wrong.
First of all, tea leaves contain a lot of tannins, theophylline and multivitamins. The thermos cup will make the tea leaves soaked in sealed high-temperature water for a long time, just like decoction with a warm fire, causing the tea to be too thick and bitter , Which greatly reduces the taste and value of tea; in addition, it also releases heavy metal substances, causing harm to the human body. Therefore, it is best to use glass or teacup for making tea.
4. Chinese medicine
Many people soak Chinese medicine in a thermos for easy carrying. However, a large amount of acidic substances are dissolved in the cooked Chinese medicine, which easily reacts with the chemical substances contained in the inner wall of the thermos, which will increase the undesirable substances in the medicinal soup, thereby affecting human health.