The Advantages and Disadvantages of Drinking Green Tea

There are many people who love to drink green tea. Green tea has many benefits. Everyone knows more or less, but there are not many people who pay attention to the disadvantages and precautions of green tea. This article will focus on the precautions that are not suitable for drinking green tea and drinking green tea. Only knowing the benefits and disadvantages of drinking green tea and scientifically drinking tea can make drinking tea a good thing. I flipped through the existing online introductions about the benefits and disadvantages of drinking green tea. The information is relatively small and scattered. I hope this article will help you better understand green tea.

The benefits of drinking green tea

  1. Green tea can invigorate the mind and enhance thinking and memory.
  2. Green tea can eliminate fatigue, promote metabolism, and maintain the normal functions of the heart, blood vessels, gastrointestinal and other functions.
  3. Drinking green tea has great benefits in preventing dental caries. According to a survey conducted in the United Kingdom, children can often reduce their dental caries by 60%.
  4. Green tea contains many trace elements that are beneficial to the human body.
  5. Green tea has the effect of inhibiting malignant tumors, and drinking tea can significantly inhibit the growth of cancer cells.
  6. Green tea can inhibit cell aging and make people prolong life. The anti-aging effect of green tea is 18 times higher than that of vitamin E.
  7. Green tea has the effect of delaying and preventing the formation of lipid plaques in the endothelium, thereby preventing arteriosclerosis, hypertension and cerebral thrombosis.
  8. Green tea can excite the central nervous system and enhance exercise capacity.
  9. Green tea has good weight loss and beauty effects, and has certain effects on acne.
  10. The tannic acid contained in green tea can kill a variety of bacteria, so it can prevent stomatitis, pharyngitis, and enteritis and dysentery that are prone to occur in summer.
  11. Drinking tea can maintain the normal acid-base balance of blood. Tea contains alkaloids such as caffeine, theophylline, theobromine, and astragalus. It is an excellent alkaline beverage. Tea can be quickly absorbed and oxidized in the extract, producing a higher concentration of alkaline metabolites, which can neutralize acidic metabolites in the blood in a timely manner.
  12. Heatstroke prevention and cooling. After drinking hot tea for 9 minutes, the skin temperature dropped by 1-2 degrees Celsius, making people feel cool and dry, while the skin temperature dropped after drinking cold drinks was not obvious.

The Disadvantage of Drinking Green Tea

The benefits of green tea are numerous, but not all people are suitable for drinking. The disadvantages of green tea are closely related to the benefits of green tea. The same effect may be beneficial to ordinary people, and may have a certain negative effect in certain situations or on specific populations. The so-called unfit for drinking, more accurately should be said to avoid frequent drinking, drink and drink plenty of tea. Occasionally one or two cups are also a kind of life, and it will not have much impact on health. In addition, healthy people drink green tea is not a taboo, if some matters do not pay attention, it will also cause harm to the body.

People Should Avoid Drinking Gree Tea

Gastric ulcer patient

Caffeine in tea can promote gastric acid secretion, and a large amount of green tea, gastric acid secretion will increase a lot, affecting the healing of the ulcer surface, aggravating the condition. People with ulcer disease should drink less tea, especially not drink plenty of tea. More, people with stomach cold should not drink too much, excessive will cause stomach upset

Neurasthenia or insomnia

Green tea can be refreshing because the caffeine in the green tea leaves has a significant excitatory effect on the central nervous system of the human body. But for people with neurasthenia and insomnia, it becomes a burden. Drinking tea, especially drinking tea, can make the brain in an overexcited state without rest, so the nervous and insomnia should be less. Drink tea, especially before going to sleep.


Because the catechin polyphenols of green tea have a certain astringent effect on the gastrointestinal mucosa, it affects the digestion and absorption function of the food, causing the stool to dry up, causing constipation or aggravation.

Heart or hypertensive patients

Excessive drinking of strong tea will increase the burden on the heart, increase heart rate and increase blood pressure, which is extremely unfavorable for patients with heart disease and hypertension.


Green tea contains a variety of biologically active substances, such as caffeine, theophylline, theobromine, etc., can accelerate the excitability of the cerebral cortex, causing cerebral vasoconstriction, insufficient blood supply, slow blood flow, and promote cerebral thrombosis. It can also cause coronary artery systolic spasm, causing myocardial ischemia, angina pectoris, palpitations, chest tightness and arrhythmia.


Green tea contains more tannic acid, which combines with iron molecules in food to form a large amount of sediment, which hinders the absorption of iron molecules by the intestinal mucosa. Iron is an important raw material for the production of red blood cells. The body’s iron deficiency can hinder the formation of red blood cells and cause iron deficiency anemia. Drinking tea for a long time may lead to different levels of iron deficiency, which has a great impact on weak blood loss and blood loss. Therefore, people with iron deficiency anemia should be cautious when drinking green tea. It is best not to drink.

Female menstrual period

Female menstruation will have mild anemia due to blood loss, and it is not reasonable to drink green tea. In addition, the green tea is cold, and women must drink green tea. Especially during menstruation, drinking green tea, especially strong tea, can induce or aggravate menstrual syndrome. Medical experts have found that compared with those who do not drink tea, there is a 2.4 times higher risk of menstrual stress in drinking tea habits, and a three-fold increase in tea drinking more than 4 cups per day.

Female pregnancy, labor and lactation

It is not suitable for drinking tea during pregnancy, especially strong tea. Generally, the concentration of caffeine in the strong tea is as high as 10%, which will increase the frequency and frequency of the urine and heartbeat of the pregnant woman, and increase the load on the heart and kidney of the pregnant woman. It is more likely to cause pregnancy poisoning, so it is better to drink less tea. wonderful.

If you drink too much tea before giving birth, the caffeine in the tea will cause excitement and cause insomnia. If you have insufficient sleep before birth, it will often lead to exhaustion during labor, weakness, and even dystocia.

A woman who wants to breastfeed herself after she has finished production should not drink too much tea. Because if you drink a lot of tea during this period, the high concentration of tannic acid in the tea will be absorbed by the mucous membrane, which will affect the blood circulation of the breast, inhibit the secretion of milk, and cause insufficient milk secretion. In addition, after the mother drinks the tea, the caffeine in the tea can penetrate into the milk and indirectly affect the baby, which is detrimental to the health of the baby.

Calcium deficiency or fracture

The alkaloids in tea can inhibit the absorption of calcium in the duodenum, and also promote the excretion of calcium in the urine, so that the body’s calcium is less and more, resulting in calcium deficiency and osteoporosis, making fracture difficult to recover. .

High fever

It is better to give boiled water, mineral water or light tea water to the fever patients, but it is not suitable to drink strong tea. Theophylline has the effect of increasing body temperature, so that the fever is aggravated, and the diuretic effect of theophylline will also reduce the efficacy of the antipyretic.

Drug taker

Avoid using green tea to take medicine, because tannic acid in green tea will combine with many drugs to produce precipitation, hinder absorption and affect drug efficacy.

Menopausal women

Women who are on menopause, in addition to dizziness and fatigue, sometimes have symptoms such as rapid heartbeat and poor sleep quality. If you drink too much tea, it will aggravate these symptoms, so people who like green tea should be at these special stages. Should drink less and avoid drinking strong tea.

Precautions for Drinking Green Tea

Drink less new tea

Although the taste of new tea is good, due to its short storage time, it contains many unoxidized polyphenols, aldehydes and alcohols, which have a strong stimulating effect on human gastrointestinal mucosa and easily induce stomach diseases. Therefore, it is best to store the new tea for at least half a month before drinking.

Drink less tea first

Most of the tea leaves are contaminated by pesticides, chemical fertilizers and other harmful substances during cultivation and processing. There is always a certain residue on the surface of the tea. Therefore, the first time the tea has a washing effect, it is best not to drink. Or choose some organic, non-agricultural tea, like Zijia tea, the use of rapeseed cake fertilizer, artificial weeding, completely avoid the harm of pesticides and fertilizer residues.

Avoid drinking tea on an empty stomach

Drinking tea on an empty stomach can dilute the gastric juice and reduce the digestive function, causing a large amount of undesirable components in the tea to enter the blood, causing symptoms such as dizziness, palpitation, weakness of hands and feet.

Avoid drinking tea after a meal

Drinking a lot of strong tea after a meal will also dilute the gastric juice and affect digestion. In addition, the tannic acid in the tea reacts with the iron molecules in the food to produce a precipitate, which also causes the body to not absorb the iron molecules in the food. Over time, it will cause iron deficiency in the human body and even induce anemia. So avoid drinking green tea within an hour after a meal.

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