1 Many people like to use a stainless steel vacuum flask to make tea. They think that the tea can be kept warm for a long time. In fact, this approach is wrong.

2 Tea leaves contain a lot of tea polyphenols, tannins, aromatic oils and multiple vitamins, so it is suitable for brewing with water at around 80°C. The stainless steel vacuum flask has the function of heat preservation. If you use the stainless steel vacuum flask to make tea, the tea leaves will be soaked in high temperature and constant temperature water for a long time, and the tea polyphenols, tannins and other substances in the tea will be leached out, making the tea strong in color and bitter in taste. Because the temperature has been kept high, the aromatic oil in the tea will be quickly released, reducing the fragrance of the tea.

3 In addition, because vitamins are not resistant to high temperatures, long-term high-temperature soaking will destroy them a lot, not only reducing the nutritional value of tea, but also long-term high-temperature soaking will increase the harmful substances in tea. If you drink this tea for a long time, it is easy to cause a variety of diseases in the digestive system, cardiovascular system, nervous system and hematopoietic system, and endanger your health. Therefore, the tea set should be made of ceramics with good air permeability, such as making tea with a purple sand teapot, without losing the original flavor of the tea, and the aroma does not diffuse. It can keep warm in winter and is not afraid of rottenness in summer. It is the first choice for tea in summer, so it is best not to use stainless steel vacuum flask to make tea.

4 Long-term use of stainless steel vacuum flask will not do any harm, and it will not cause cancer because it contains heavy metals. The heavy metal in the stainless steel vacuum flask is the metal needed by the human body, which is beneficial and harmless.

But never use a stainless steel vacuum flask to make tea, it is harmful to the human body.

Why is it easy to lose vitamins when making tea in a stainless steel vacuum flask? Usually tea leaves contain a variety of vitamins, in addition to a large amount of theophylline, tea sesame oil, and tannic acid. The tea leaves in the stainless steel vacuum flask are soaked in high-temperature water for a long time, which will destroy the multivitamins in the tea. At the same time, a large amount of tannic acid and theophylline will leak out, and a large amount of tea sesame oil will also evaporate. In this way, many ingredients in a lot of tea are lost, and the nutritional value of the tea is also reduced, making the tea juice without fragrance.

Therefore, in our daily life, it is best not to make tea in a stainless steel vacuum flask. If you want to drink tea, it is also convenient. We can brew the tea in a purple clay pot or tea set, and then pour it into a stainless steel vacuum flask, so that vitamins will not be lost and the tea can be kept warm.