11 benefits and 7 Side effects of drinking green tea


Everyone likes to drink green tea, because the efficacy and effects of green tea have great benefits to human health. But the so-called advantages have disadvantages, and green tea is no exception. So what do you know about the benefits of green tea?  And side effects of green tea? Let us introduce the benefits and side effects of drinking green tea.

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What are the benefits of Green Tea ?

Green tea is almost a healthy icon. As long as the label is related to green tea, everything is equivalent to health. Is green tea beneficial and harmless? Are there any taboos to drink green tea?

Green tea has not been fermented, so its content of antioxidant nutrients is higher than that of oolong tea (semi-fermented) or black tea, so it has attracted more attention in preventing diseases.

Green tea contains a kind of polyphenol antioxidant, which functions to avoid the damaging effects of free radicals. Free radicals can damage cell DNA, which is the first step to cause normal cells to deteriorate into cancer cells. According to research, people who regularly drink green tea are less likely to suffer from gastric cancer, lung cancer, esophageal cancer, pancreatic cancer and colon cancer, and have a lower incidence of heart disease. Green tea can also prevent abnormal blood clotting and lower blood pressure. And cholesterol, and increase the content of good cholesterol (high-density lipoprotein).

Do you like green tea?

I often hear that drinking green tea is good for health. What are the benefits of green tea?

1. Reduce fat and cholesterol:

The polyphenols, amino acids, and vitamins contained in green tea can help reduce the blood fat content of the human body and help burn excess fat in the body under the comprehensive coordination, especially the tea polyphenols and vitamin C, which promote fat oxidation and help digestion And the key to reducing fat and losing weight. In addition, it is also very helpful for improving good cholesterol in the body. A Japanese study found that a daily intake of 500mg of catechin (Catechin), after 3 months, although the total cholesterol concentration did not change, but the high-density lipoprotein cholesterol concentration increased significantly.

2. Anti aging

No matter oolong tea, black tea or green tea, tea has a strong antioxidant substance Epigallocatechin Gallate (EGCG), which can neutralize free radicals in the body and help delay aging. Studies have shown that EGCG’s antioxidant effect is 10 times stronger than vitamin E and 2 times stronger than red wine. It can be said to be an important substance that helps delay aging.

3. Increase bone density

A study by the Texas Tech University Health Science Center showed that menopausal women taking 500 mg of green tea polyphenol capsules (approximately equivalent to 4-6 cups of tea) for 6 months can promote bone remodeling and delay bone loss. In addition, a study by the hospital affiliated with National Cheng Kung University also found that those who have been accustomed to drinking tea for more than 10 years have the best bone density, and those who have been used to drinking tea for more than 6-10 years have higher bone density than those who do not drink tea.

4. Free radical scavenging

A study published in the British medical journal Nanomedicine pointed out that the “EGCG” substance in green tea has a significant effect on skin cancer. Whether it is green tea, black tea or oolong tea, the high levels of polyphenols in tea have the ability to eliminate free radicals, Suppress bad cell components.

5.Prevent tooth decay

Tea contains fluoride, which can inhibit bacteria. Catechin can also inhibit streptococcus and other bacteria. It can help reduce the adhesion of bacteria to teeth and stay in the mouth, reducing the chance of tooth decay. It has also been clinically proven that catechins can significantly reduce dental bacteria. The film forms, but it has no effect on other microorganisms in the oral cavity.

6. Anti-radiation and UV

Modern people use computers and mobile phones every day, and the exposure to radiation is higher than in the past. In addition to the rich vitamin C content of tea, catechins can also resist radiation damage caused by UVB; rich vitamin A can help resist computer radiation to the eyes Damage, protect eyesight.

7. Refreshing

The polyphenols and catechins in green tea can help reduce the degradation of brain neurotransmitters (such as dopamine and adrenaline), which can help people quickly restore energy, especially those who are sleepy when they wake up in the morning. Green tea can effectively rejuvenate the brain. Green tea contains less caffeine than coffee, and it is less irritating to the human body.

8. Precautions

Green tea has now become a popular health care product, especially because of the overwhelming advertisements highlighting the effect of green tea, and various related beauty and health products with green tea as the main ingredient are emerging in an endless stream, making green tea the best choice for skin care and health. In this regard, experts remind consumers that fashion trends cannot be blindly followed.

9. Health products

Green tea itself, as a health product, has no harm to health, but if it is used by merchants to make different health products with other raw materials, consumers should pay attention to whether it has the effect that matches the label.

10. Skin care products

Green tea skin care products are popular and become the natural skin care favorites pursued by ladies.  

Green tea has skin care and beauty effects, mainly one of the substances called tea polyphenols. This substance has anti-oxidant effects. When combined with vitamins B and E, it can replenish moisture and firm the skin. However, it must be noted that as a general term for phenolic substances or their derivatives, tea polyphenols are easily volatilized in the air, resulting in loss of their antioxidant effect, so green tea skin care products, especially facial masks, can maintain The effectiveness of tea polyphenols is questionable, and there are suggestions that products made from the new tea of ​​the year would be better.  

11. Weight loss and disease prevention

Green tea contains a certain amount of caffeine. When it coexists with tea polyphenols, it can inhibit the effect of caffeine in stimulating gastric acid secretion in the stomach. In addition, the aromatic compounds contained in green tea can also help break down fat and prevent fat accumulation in the body. However, women should not drink green tea during menstruation. Studies have shown that in addition to normal human iron loss, women also lose 18-21 mg of iron during each menstrual period. Green tea has a high content of tannins, which will combine with iron molecules in food to form a large amount of sediment and hinder the intestinal tract. The mucous membrane absorbs iron molecules. The stronger the green tea, the greater the barrier to iron absorption.

Although green tea is beneficial, because it has not been fermented, it retains more fresh natural substances, such as tea polyphenols and caffeine, and contains more chlorophyll, which is more irritating to the gastrointestinal tract. This is why some people feel uncomfortable after drinking green tea. the reason. It is best not to drink green tea for patients with gastrointestinal problems, but black tea for tea.

Side effects and contraindications of drinking green tea

Green tea is a non-fermented tea. Because of its characteristics, it retains more natural substances in the fresh leaves. Among them, tea polyphenols and caffeine account for more than 85% of fresh leaves, chlorophyll accounts for about 50%, and vitamin loss is less. Therefore, green tea has the characteristics of “clear soup, green leaves and astringency”. It has anti-aging, anti-radiation, detoxification, diuretic, anti-bacterial, anti-inflammatory and other effects, not as good as fermented tea. Green tea itself has no side effects, but tea is forbidden. Drinking tea improperly or blindly may have side effects on health.

1. Green tea cannot drink new tea

Usually when you drink green tea, try not to drink the new tea that has just been produced, because the storage time of new tea is relatively short. It contains a large amount of non-oxygenated polyphenols and some alcohols. These substances are irritating to the human stomach. Obviously, it is easy to cause stomach problems, especially those people who have stomach problems themselves. After drinking the new green tea, the illness will be aggravated and harmful to the body.

2. People with cold stomach can’t drink green tea

Green tea is a kind of cold drink. People who usually suffer from stomach cold should not drink green tea. It contains some substances that can stimulate the stomach and intestines, which can aggravate the symptoms of stomach cold and easily cause stomach pain or diarrhea. In addition, when brewing green tea, the first bubble cannot be drunk, because there will be some residual substances on the surface of green tea, which will be decomposed in the first bubble tea, if people drink the first bubble, these harmful substances will be absorbed into the body.

3. Do not drink green tea while taking medicine

Usually people cannot drink green tea if they are taking medicine, because the tannic acid in green tea will react with some of the medicine components in the medicine, which will cause these medicines to precipitate and reduce its medicinal efficacy. Failure to have the therapeutic effect will delay the treatment and recovery of the condition.

4. People with anemia should not drink green tea:

For people with anemia, the body lacks iron. Green tea contains tannic acid. This substance and iron will synthesize insoluble final compounds. If people with anemia still drink green tea , The source of iron in the body is even less.

5. People who drink green tea are not suitable for drinking green tea:

There is a habit in the countryside, that is, a cup of strong tea is used to hangover after being drunk. In fact, it is the least suitable for drinking tea after being drunk. Strong tea will increase the burden on the heart, and green tea can also accelerate diuresis. The effect is that the toxic aldehydes in alcohol are excreted through the kidneys before being decomposed, which is very irritating and harmful to human kidneys.

6. ​​It is not suitable for people to drink green tea before going to bed:

The caffeine in green tea can excite one’s nerves and affect sleep quality. Drinking too much tea can even cause insomnia, especially freshly picked green tea.

7. People with fever should not drink green tea:

the caffeine contained in green tea can raise the body temperature of the body.


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