Don’t drink overnight tea.

After drinking overnight tea for too long, most of the vitamins have been lost, and the protein, sugar, etc. in the tea soup will become nutrients for the reproduction of bacteria and mold. Therefore, for the sake of health, it is best not to drink overnight tea.

Overnight tea generally refers to tea that has been soaked for more than 12 hours or left overnight. Overnight tea will produce nitrite. In people's daily diet, most of the nitrite is excreted in the human body like "passengers" in the urine. It will only be converted into nitrosamines under specific conditions.

Therefore, under normal conditions, nitrite in the diet will not cause harm to human health. Only excessive intake and lack of vitamin C in the body can cause harm to the human body. Tea itself is rich in vitamin C and tea polyphenols, which act as natural inhibitors of the synthesis of nitrosamines.

However, from the perspective of nutrition and hygiene, many nutrients in overnight tea are lost, and the microbial content will increase. If deterioration occurs under certain circumstances, there is also the potential for harm due to an individual's physical condition.

Extended information

Precautions for making tea:

1. Be careful when making tea with a thermos cup

Although the thermos cup can keep heat , but the multivitamins and aromatic oils in tea are easily lost in high temperature or long-term constant temperature water, and the effectiveness and taste of tea are also reduced. Good tea sets should first be made of pottery, which has a certain degree of air permeability, keeps heat in winter, does not go rancid in summer, and does not undergo any chemical reactions.

2. Use boiling water to brew tea, and pay attention to controlling the temperature

Some people like to brew tea with freshly boiled water. In fact, this is very harmful. The high temperature of freshly boiled water can destroy a large amount of nutrients in the tea that are not resistant to high temperatures (such as vitamin C, etc.), and the aroma of the tea will quickly disappear. The water temperature for brewing tea should be divided according to the age and tenderness of the tea leaves. For old tea, boiling water of 95°C can be poured directly into it; for tender tea, it should be lower, around 80°C is more suitable.

3. Do not brew the same tea multiple times

Tea should be drunk regularly rather than frequently. Tea should be brewed as you drink and do not leave it alone for too long. If tea is brewed for too long, many substances harmful to the human body will be brewed out.

If the brewing time is too long, the tea polyphenols, lipids, aromatic substances, etc. in the tea can be automatically oxidized. Not only is the tea soup dark in color, poor in taste, low in aroma, and loses its tasting value; at the same time, due to the time the tea is left aside For too long, due to the pollution of the surrounding environment, the number of microorganisms (bacteria and fungi) in the tea increases, affecting hygiene.

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