Some questions about tea.

Drinking tea is not only a traditional food culture, but also has a certain effect on scavenging free radicals because tea contains a variety of antioxidant substances and nutrients. Therefore, drinking tea also helps to prevent aging and has a health care effect. Drinking three or two cups of tea every day can prevent aging. Tea contains many vitamins and amino acids. Drinking tea also has certain effects of clearing oil and relieving boredom, enhancing nerve excitement and promoting digestion and diuresis.

But the more you drink, the better, and not everyone is suitable for drinking tea. Generally speaking, 65438+ 0-2 times a day, 2-3 grams each time is more appropriate.

(a) who is not suitable for drinking tea?

1) iron deficiency anemia:

Tannic acid in tea will affect the body's absorption of iron and aggravate anemia.

2) neurasthenia:

Caffeine in tea can make people excited, increase basal metabolism and aggravate insomnia.

3) Patients with dynamic gastric ulcer:

Caffeine stimulates the secretion of gastric juice, aggravates the condition and affects the healing of ulcer.

4) Urinary calculi:

Oxalic acid in tea will lead to an increase in stones.

5) Patients with poor liver function:

Caffeine is mostly metabolized by the liver, and drinking tea for people with poor liver function will increase the burden on the liver.

6) constipation:

Tanning has astringent effect, which can weaken intestinal peristalsis and aggravate constipation.

7) Lactating women:

Caffeine can enter the baby's body through milk, which will cause intestinal spasm and anemia and affect the child's sleep.

8) Patients with heart disease:

Drinking too much tea will accelerate the heart rate, and some may have arrhythmia.

9) Pregnant women:

Drinking too much tea will make the baby thin.

10) Drunk:

Alcohol has a great stimulus to the cardiovascular system, and caffeine can make the heart beat faster. The combination of the two is very dangerous for people with poor heart function.

(2) Pay attention to drinking tea

1. Avoid drinking tea on an empty stomach. Tea into the heart will cool the spleen and stomach.

2. Avoid drinking hot tea, preferably below 56℃.

3. Avoid drinking Leng Cha, Leng Cha is cold and stagnates, accumulating phlegm.

4. Avoid brewing for too long to prevent oxidation and bacterial pollution.

5. Avoid repeated brewing, harmful trace elements in tea will bubble out at last.

6. avoid drinking before meals, tea will dilute stomach acid.

7. Avoid drinking tea immediately after meals. Tannic acid in tea will affect digestion.

8. Avoid taking medicine with tea. Tannic acid in tea will affect the efficacy.

9. Avoid drinking overnight tea, it will deteriorate after a long time.

10. Don't drink tea after drinking. Drinking tea after drinking will hurt the kidneys.

1 1. Avoid drinking strong tea. Caffeine is addictive and toxic.

12. The inedible teas are: burnt tea, moldy tea, and cross-flavored tea.

(3) Pay attention to drinking tea

First, pay attention to the difference between the four seasons, that is, drink scented tea in spring, green tea in summer, green tea in autumn and black tea in winter. The reason is that people who drink scented tea in spring can emit the cold evil accumulated in the human body all winter, and the rich fragrance can promote the occurrence of human yang. In summer, drinking green tea is better. Green tea tastes bitter and cold, which can clear away heat and relieve summer heat, detoxify and quench thirst, and strengthen the heart. In autumn, drinking green tea is better. This kind of tea is neither too hot nor too cold, which can eliminate residual heat in the body and restore body fluid. Drinking black tea in winter is ideal. Black tea is sweet and warm, rich in protein, which can help digestion, tonify the body and strengthen the body.

Second, pay attention to the amount of tea, drink 2 ~ 6 grams of tea every day. Although tea contains a variety of vitamins and amino acids, drinking tea can relieve boredom, enhance nerve excitement and promote digestion and diuresis, but not the more you drink, the better, and not everyone is suitable for drinking tea. Generally speaking, 65438+ 0-2 times a day, 2-3 grams each time, is more appropriate. It is not suitable for patients with neurasthenia, insomnia, hyperthyroidism, tuberculosis, heart disease, gastropathy and intestinal ulcer, nor for lactation period, pregnant women and infants.

Third, don't drink too strong tea. Strong tea will make the "excitability" of human body too high, which will have adverse effects on cardiovascular system and nervous system. Patients with cardiovascular diseases may have tachycardia or even arrhythmia after drinking strong tea, which leads to repeated illness.

Fourth, don't drink tea before going to bed. This is more important for early tea drinkers. After drinking tea before going to bed, it becomes very difficult for many people to fall asleep, which even seriously affects their mental state the next day. People with neurasthenia or insomnia should pay special attention.

5. Don't drink a lot of tea while eating. Drinking a small amount of tea before or during meals is not a big problem, but if you drink a lot of tea or drink too much tea, it will affect the absorption of many macro elements (such as calcium) and trace elements (such as iron and zinc). Pay special attention not to drink tea at the same time when drinking milk or other dairy products. Theophylline and tannic acid in tea will combine with calcium in dairy products to form water-insoluble calcium salts, which will be excreted, greatly reducing the nutritional value of dairy products.

Sixth, it is not advisable to drink tea after drinking. After drinking, the alcohol in the wine enters the blood through the gastrointestinal tract and is converted into acetaldehyde in the liver, which is then converted into acetic acid, which is then decomposed into carbon dioxide and water to be discharged. After drinking tea, theophylline in tea can quickly diuretic the kidney, thus promoting the undecomposed acetaldehyde to enter the kidney prematurely. Acetaldehyde has a great stimulating effect on the kidney, so it will affect the renal function. People who often drink strong tea after drinking are prone to kidney disease. Not only that, the ethanol in wine is very irritating to the cardiovascular system, and tea also has the effect of exciting the heart. The combination of the two enhances the stimulation to the heart, so drinking tea for heart patients is more harmful.

Seven, tea is not as fresh as possible. In terms of nutrition, the freshest tea is not necessarily the best, because the so-called new tea refers to the tea that has been picked for less than one month. Because these tea leaves have not been placed for a period of time, some substances that have adverse effects on the body, such as polyphenols, alcohols, aldehydes, etc., have not been completely oxidized. If you drink new tea for a long time, you may have discomfort such as diarrhea and bloating. Too fresh tea is even worse for patients, such as some people with gastric acid deficiency or elderly patients with chronic gastric ulcer, which is even more unsuitable for drinking new tea. New tea will stimulate their gastric mucosa, cause gastrointestinal discomfort and even aggravate their condition.