1. Avoid tea when you have a fever
Caffeine in tea not only raises body temperature but also reduces the effectiveness of medication.
2. People with liver disease should avoid drinking tea
Most substances in tea, such as caffeine, are metabolized by the liver. If you have liver disease and drink too much tea, exceeding the liver's metabolic capacity, it can damage liver tissue.
3. People with neurasthenia should be cautious when drinking tea
Caffeine in tea has a stimulating effect on the central nervous system. People with neurasthenia who drink strong tea, especially in the afternoon and evening, may experience insomnia and worsen their condition. They can drink tea once in the morning and once in the afternoon. In the morning, it is advisable to drink scented tea, and in the afternoon, green tea. No tea should be consumed in the evening. This way, the patient will feel refreshed during the day and calm at night, helping them fall asleep more easily.
4. Pregnant women should avoid drinking tea, especially strong tea
Tea contains a large amount of tea polyphenols and caffeine, which have many adverse effects on the growth of the fetus in the womb. To ensure the normal intellectual development of the fetus and avoid excessive stimulation from caffeine, pregnant women should drink little to no tea.
5. Women who are breastfeeding should not drink strong tea
Drinking strong tea during breastfeeding can lead to excessive caffeine entering the breast milk. When the baby ingests the milk, it can indirectly cause excitement, leading to less sleep and more crying.
6. Patients with ulcers should be cautious when drinking tea
Tea is a stimulant for gastric acid secretion. Drinking tea can increase the amount of gastric acid secreted, stimulating the ulcerated surface. Regular consumption of strong tea can worsen the condition. However, for mild cases, some weak tea can be consumed 2 hours after taking medication. Sweetened black tea or milk-added black tea can help reduce inflammation and protect the gastric mucosa, and also have a certain effect on ulcers. Drinking tea can also block the synthesis of nitrosamines in the body, preventing precancerous mutations.
7. People with malnutrition should avoid drinking tea
Tea has the function of breaking down fat. For people who are malnourished, drinking tea to break down fat will worsen their nutritional status.
8. Be cautious when drinking tea when drunk
Tea has a stimulating effect on the central nervous system. Drinking strong tea after being drunk will加重 the burden on the heart.
Drinking tea also accelerates diuresis, causing toxic aldehydes in the alcohol to be excreted by the kidneys before they are broken down, which is highly irritating to the kidneys and harmful to health. Therefore, people with heart or kidney disease or poor function should not drink tea, especially not large amounts of strong tea. For healthy people, a small amount of strong tea can be consumed. After sobering up, they can eat a large amount of fruit or drink vinegar in small sips to speed up the body's metabolism and alleviate drunkenness.
9. Be cautious about taking medicine with tea water
There are many types of drugs with different properties, so whether tea water can be used to take medicine cannot be generalized. The tannins and theophylline in tea can undergo chemical changes with certain drugs. Therefore, when taking sedatives, hypnotics, and drugs containing iron, enzymes, or protein, it is not advisable to take them with tea water, as tea polyphenols can easily react with iron supplements to form precipitates, which may affect the drug's efficacy.
Some traditional Chinese medicines, such as ephedra, gambir, and coptis, should not be mixed with tea water. Generally, it is not advisable to drink tea within 2 hours after taking medication. However, when taking certain types of vitamins, tea water has no effect on the drug's efficacy, because the tea polyphenols in tea can promote the accumulation and absorption of vitamin C in the human body. At the same time, tea itself contains various vitamins and has effects such as excitement, diuresis, lowering blood lipids, and lowering blood sugar, which is beneficial to enhancing drug efficacy and restoring health. Additionally, in folk medicine, it is also believed that it is not advisable to drink tea when taking tonics like ginseng and deer antler, which also has a certain rationale.
10. Patients with coronary heart disease should be cautious when drinking tea
For coronary heart disease patients with a rapid heart rate, premature beats, or atrial fibrillation, the caffeine and theophylline in tea are stimulants that can enhance heart function. Drinking large amounts of strong tea can speed up the heartbeat, often triggering an episode or worsening the condition. Therefore, such people can only drink some weak tea. In contrast, patients with a heart rate generally below 60 beats per minute should drink more tea, which is not only harmless but can also increase the heart rate and complement the drug therapy.
11. The elderly should not drink unroasted green tea
Unroasted green tea refers to baked green tea that is directly dried after fixation without rolling. This tea has a natural green color, and its internal components are basically the same as the compounds in fresh leaves, with little conversion and volatilization of low-boiling point aldehyde and alcohol compounds, giving it a strong raw, green aroma. When the elderly drink this type of green tea, it is highly irritating to the gastric mucosa and can easily cause stomach pain after consumption. Young people may also feel discomfort in the stomach after drinking it, a phenomenon commonly known as "scraping the stomach." If this type of tea is accidentally purchased, it is best not to brew it directly. It can be placed in a greaseless iron pan and slowly roasted over a low flame to remove the raw, green aroma until a light chestnut aroma is produced, after which it can be consumed.
12. Patients with hypertension should not drink strong tea
"Strong tea" is defined as tea using less than 50 milliliters of boiling water per gram for the first infusion. Patients with hypertension who drink too much or too strong tea may experience an increase in blood pressure due to the stimulant effect of caffeine, which is detrimental to health.