The disadvantages of drinking black tea: usually easily agitated or more sensitive, poor sleep and weaker people, the night or to drink less or not drink black tea is appropriate. Black tea should not be put cold and then drink, affecting the effect of warming the stomach, placed too long will reduce the nutrient content, at the same time because the black tea is fermented, long brewing time can easily lead to the emergence of unstable nutrients may be harmful to the body, it would be more than worth the loss.

The bad thing about drinking Coke:

1, Coke contains caffeine, long drink addictive.

2, Coke contains carbonic acid, drinking too much is not good for the body. Because the human body is in the best state when it is weakly alkaline.

3. Drinking too much Coke hurts your teeth. Because Coke contains phosphoric acid and carbon dioxide dissolved in the formation of carbonic acid, the tooth enamel has a certain corrosive effect.

4, cola contains a lot of sugar, these sugar absorption rate is very fast, easy to cause excessive calorie intake. Long drink will be fat.

5, cola contains a high component of caffeine, caffeine in the body is very will jeopardize the fetal brain, heart and other organs, the same will make the fetus cause deformities or congenital diseases.

6, cola will lead to osteoporosis. People who love to drink Coke are five times more likely to break a bone than those who don't drink soda-based beverages. The phosphoric acid in Coke may be the cause of the increased fracture rate, because a large amount of phosphorus affects the body's absorption of calcium. The caffeine contained in Coke also has the effect of decalcification

7. Coke can dissolve iron nails. There have been experiments, the iron nail into the cola, the iron nail will actually gradually dissolve! The phosphoric acid in Coke is a strong acid, even after dilution, there is a certain acidity. Although Coke won't dissolve our stomachs, it will still bring a certain burden to the stomach, and people with gastric ulcers are advised not to drink it.

8, cola drink more easy to get esophageal cancer.