Green tea contains a lot of caffeine, these alkaloids can promote the excitement of the brain center, so people who often suffer from insomnia had better not drink tea, especially before going to bed, otherwise it will make the body more excited and difficult to fall asleep.

2, anemia patients avoid drinking green tea.

Tannic acid in green tea leaves can combine with iron to form an insoluble final compound, so that the body can not get enough iron sources, so anemia patients should not drink tea.

3. Patients with urinary calculi should avoid drinking green tea.

Urinary calculi are usually calcium oxalate stones. Because tea contains oxalic acid, it will form stones with calcium excreted by urine. If patients with urinary calculi drink a lot of tea, it will aggravate their condition.

Extended data

The efficacy of drinking green tea

1, refreshing

Many people choose to drink a cup of green tea when they are sleepy, because green tea contains a lot of caffeine. Drinking tea can promote the excitement of nerve center and cerebral cortex, which has a certain effect on relieving migraine. But don't drink tea before going to bed at night, or you will easily lose sleep.

2. Prevent cancer

Green tea also contains a lot of tea polyphenols, which can block the synthesis of many carcinogens such as nitrate, and can effectively kill cancer cells and improve the body's immunity. Green tea is usually better for old friends and can prevent cancer. Tea polyphenols can also sterilize and diminish inflammation, and have obvious inhibitory effect on bacteria.

3, delay aging

Tea contains lipopolysaccharide, which can help the body resist radiation, especially in summer. It can resist the ultraviolet radiation of the sun and avoid the harm of strong radiation to the skin. In addition, tea polyphenols in green tea can remove their own protective cell membrane and delay skin aging, which is necessary for beauty-loving women.

4, burning fat

Tea is one of the essential products for girls who love beauty. As mentioned above, lipopolysaccharide in tea can help resist radiation and delay aging. Tea is rich in vitamin C, and its extremely low calorie can reduce the accumulation of fat in the body, which has the function of burning fat.

People's Network-What are the effects of drinking green tea? What are the taboos for drinking green tea?

People's Daily Online-Drinking tea is good for health, and these people should not drink it.