Too much to drink. . . . . .
■ News background: It is reported that a recent study in the United States found that the fluoride content in many instant teas exceeded the standard, and excessive drinking would lead to skeletal fluorosis. The standard of fluoride in bottled water and beverages stipulated by the US Food and Drug Administration is no more than 2.4ppm per liter, while the fluoride in ordinary Lipton instant tea sold in the market is 6.5ppm per liter. On March 29th, the Tea Quality Supervision and Testing Center of the Ministry of Agriculture officially announced that the fluorine content of Lipton series products tested all met the national standards.
Although it is a false alarm that the fluoride in Lipton black tea exceeds the standard, it makes us find a long-neglected health problem: drinking tea may also lead to fluorosis. Tea is a traditional health drink in China, which has many benefits to human health, but just like eating food, we should understand the nature of tea. If you don't pay attention to the method of drinking tea, tea will also endanger your health. For example, drinking too much strong tea often can lead to fluorosis.
The safe intake of fluoride in human body is 3 ~ 4.5 mg per day. If you drink tea excessively for a long time, it will lead to dental fluorosis and skeletal fluorosis. To prevent fluorosis, we should pay attention to the following three points:
1. It is best not to drink more than 5g of tea every day. 2. Drink less brick tea with high fluorine content. The elderly and patients with poor renal function should not drink a lot of tea.
Some people like to drink strong tea because caffeine, theophylline and theobromine in tea can excite the central nervous system, but in this way, the possibility of fluorosis is undoubtedly aggravated. Therefore, women during pregnancy, lactation and menstrual period, as well as patients with peptic ulcer, severe arteriosclerosis and hypertension, insomnia and fever should pay attention to drinking less tea or not drinking tea.
If you want to drink tea healthily, you need to pay attention to the "twelve taboos": 1. Don't drink tea on an empty stomach, tea will cool the spleen and stomach. 2. Avoid drinking hot tea, preferably below 56℃. 3. Avoid drinking Leng Cha, Leng Cha is cold and stagnates, accumulating phlegm. 4. Avoid brewing for too long to prevent oxidation and bacterial pollution. 5. Avoid repeated brewing, harmful trace elements in tea will bubble out at last. 6. avoid drinking before meals, tea will dilute stomach acid. 7. Avoid drinking tea immediately after meals. Tannic acid in tea will affect digestion. 8. Avoid taking medicine with tea. Tannic acid in tea will affect the efficacy. 9. Avoid drinking overnight tea, it will deteriorate after a long time. 10. Don't drink tea after drinking. Drinking tea after drinking will hurt the kidneys. 1 1. Avoid drinking strong tea. Caffeine is addictive and toxic. 12. The inedible teas are: burnt tea, moldy tea, and cross-flavored tea.
Health Times (2nd edition, April 7th, 2005)