1. People with neurasthenia should drink tea cautiously.
The caffeine in tea excites the nerve center. Drinking strong tea, especially in the afternoon and evening, can cause insomnia and worsen the condition for those with neurasthenia. They can drink tea once in the morning and once in the afternoon. In the morning, they might drink flower tea, and in the afternoon, green tea, but avoid tea in the evening. This way, patients can feel mentally refreshed during the day and calm in the evening, helping them fall asleep earlier.
2. Patients with liver disease should avoid drinking tea.
Substances like caffeine in tea are mostly metabolized by the liver. If the liver is diseased, drinking too much tea beyond the liver's metabolic capacity can damage liver tissue.
3. Pregnant women should avoid drinking tea, especially strong tea.
Tea contains a lot of tea polyphenols, caffeine, etc., which can adversely affect the fetus's development in the womb. To ensure the fetus's intellectual development proceeds normally and avoid excessive stimulation from caffeine, pregnant women should drink little or no tea.
4. Women during lactation should not drink strong tea.
Drinking strong tea during lactation means excessive caffeine enters the breast milk. After suckling, the infant may indirectly become excited, leading to less sleep and more crying.
5. Ulcer patients should drink tea cautiously.
Tea is a stimulant for gastric acid secretion. Drinking tea can increase gastric acid secretion, exacerbating the stimulation on the ulcer surface. Regularly drinking strong tea can worsen the condition. However, for mild cases, drinking some weak tea two hours after taking medicine, such as sugared black tea or milk tea, can help reduce inflammation and protect the gastric mucosa, and may have some positive effect on ulcers. Drinking tea can also block the synthesis of nitrosocompounds in the body, preventing precancerous mutations.
6. Be cautious about drinking tea when drunk.
Tea excites the nerve center. Drinking strong tea after alcohol intoxication increases the burden on the heart.
Drinking tea also accelerates diuresis, causing toxic aldehydes from alcohol to be excreted by the kidneys before being broken down, which significantly irritates the kidneys and endangers health. Therefore, people with heart or kidney diseases or poor function should not drink tea, especially not large amounts of strong tea; for healthy individuals, they can drink a small amount of strong tea. After sobering up, they can eat large amounts of fruit or sip vinegar to speed up the body's metabolism and alleviate drunkenness.
7. Be cautious about taking medicine with tea.
There are many types of medicines with different properties. Whether tea can be used to take medicine cannot be generalized.
Tannins and theophylline in tea can chemically react with certain drugs. Therefore, when taking hypnotic, sedative drugs, iron-containing hematinics, enzyme preparations, or protein-containing drugs, it is not advisable to use tea to take medicine because tea polyphenols easily react with iron agents to form precipitates, which could affect the drug's efficacy.
8. Patients with urinary stones should avoid drinking tea.
Urinary stones are usually calcium oxalate stones. Since tea contains oxalic acid, which can form stones with calcium excreted in urine, if patients with urinary stones drink large amounts of tea, it will worsen their condition.
9. Avoid drinking tea on an empty stomach.
Drinking tea on an empty stomach dilutes stomach acid and inhibits gastric juice secretion, hindering digestion. It can even cause symptoms like palpitations, headaches, stomach discomfort, dizziness, and irritability, known as "tea drunkenness," and affect protein absorption, potentially causing gastritis. If "tea drunkenness" occurs, sucking candy or drinking some sugar water can alleviate the symptoms.
10. Avoid drinking large amounts of tea immediately before or after meals.
It is not advisable to drink tea about 20 minutes before or after meals. Drinking tea at these times dilutes gastric juice, affecting food digestion. Moreover, because tea contains oxalic acid, it reacts with iron and protein in food, affecting the body's absorption of iron and protein.
11. Avoid drinking tea before bedtime.
It is best not to drink tea within 2 hours before sleep. Drinking tea can cause mental excitement, affect sleep, or even cause insomnia, especially freshly picked green tea, which can make nerves extremely excited and lead to insomnia after consumption.
12. Patients with coronary heart disease should drink tea cautiously.
For coronary heart disease patients with tachycardia, premature beats, or atrial fibrillation, since caffeine and theophylline in tea are stimulants that enhance heart function, drinking large amounts of strong tea accelerates the heartbeat, often triggering or worsening their condition. Therefore, such individuals can only drink some weak tea; conversely, patients with a heart rate generally below 60 beats per minute should drink more tea, which is not harmful but can increase heart rate, complementing drug treatment.