Some people enjoy strong tea because the caffeine, theophylline, and theobromine in it can stimulate the central nervous system. However, this undoubtedly increases the risk of fluorosis. Therefore, women who are pregnant, breastfeeding, or menstruating, as well as patients with ulcers, severe arteriosclerosis, high blood pressure, individuals with insomnia, and those with a fever should be cautious about drinking tea or avoid it altogether.
To drink tea healthily, one must also pay attention to the "Twelve Taboos":
1. Do not drink tea on an empty stomach, as it can harm the spleen and stomach.
2. Do not drink scalding hot tea; the temperature should ideally be below 56°C.
3. Do not drink cold tea, as it can lead to stagnation of cold and phlegm accumulation.
4. Do not steep tea for too long to prevent oxidation and bacterial contamination.
5. Do not re-brew tea too many times, as harmful trace elements can be released in the later brews.
6. Do not drink tea before meals, as it can dilute stomach acid.
7. Do not drink tea immediately after a meal, as the tannins in tea can interfere with digestion.
8. Do not take medicine with tea, as the tannins can affect the drug's efficacy.
9. Do not drink overnight tea, as it can spoil after being left out for a long time.
10. Do not drink tea after consuming alcohol, as it can harm the kidneys.
11. Do not drink strong tea, as the caffeine can be addictive and toxic.
12. Teas that should not be consumed include those with a burnt flavor, moldy tea, and tea that has absorbed other odors.