The harm of drinking strong tea for a long time:

1, the effect on the heart. According to analysis, tea contains 2% to 5% caffeine, strong tea caffeine content is higher. A cup of strong tea contains about 100 milligrams of caffeine, excessive caffeine can lead to excessive nerve excitation, causing insomnia; at the same time can also cause rapid heartbeat, suffering from tachycardia, premature beats and atrial fibrillation of coronary artery disease patients are not favorable.

2, causing dilution of gastric juice, can not be normal digestion. Because a person's normal daily secretion of gastric juice 1.5 to 2.5 liters, these gastric juice can be a person every day to take in the food for reasonable digestion, and strong tea will dilute gastric juice, resulting in indigestion, bloating, abdominal pain and other symptoms. This is especially true for the elderly and children whose stomachs and digestive systems are fragile.

3, often drink strong tea is one of the reasons to promote osteoporosis. The reason is that tea contains more caffeine, and caffeine can promote urinary calcium excretion and bone calcium loss.

4, affecting nutrient absorption. Strong tea contains tannic acid, tannic acid can be combined with food proteins, vitamin B1, iron ions, so that these nutrients can not be properly absorbed, easy to cause the human body nutrient deficiencies and produce corresponding symptoms, such as anemia, constipation, and so on.

5, easy to produce constipation. Tea tannins can also be combined with food proteins to generate a block, not easily digested and absorbed tannins, resulting in constipation.

Extended information:

The benefits of drinking tea properly

1, improve muscle endurance . Research has found that tea contains a kind of antioxidant called "catechins", which can increase the body's ability to burn fat, improve muscular endurance, help fight fatigue, and increase the time of physical activity. Drinking green tea often has the most significant effect.

2. Tea contains a large amount of vitamin C, which can lower the cholesterol value and thus become the best drink to cope with excessive cholesterol.

3, tea polyphenols are water-soluble substances, tea wash face can remove facial oil, astringent pores, with disinfection, sterilization, anti-aging effect of the skin, but also help to reduce the sun's ultraviolet damage to the skin, is a natural "sunscreen.

4, tea origin of stroke mortality rate significantly lower, narrow heart disease, myocardial infarction due to vitamin C deficiency and the higher the mortality rate.

5, tea polyphenols help the brain for local regulation, improve memory, improve learning efficiency. Foreign research has confirmed that drinking tea can prevent and treat neurological diseases, especially cognitive impairment in old age. In addition, caffeine can promote central nervous system excitation, refreshing, thinking, clearing the mind effect.

Reference link: people.com.cn - Attention! Long-term drinking of strong tea affects heart and gastrointestinal health