After drinking alcohol, it is converted in the liver into acetaldehyde, then into acetic acid, and finally broken down into water and carbon dioxide, which are excreted by the kidneys, causing little harm to the kidneys. However, if strong tea is consumed after drinking, the diuretic effect of theophylline can cause acetaldehyde to be directly excreted by the kidneys, thereby quickly relieving intoxication. Acetaldehyde is harmful to the kidneys, and frequently using strong tea to sober up can lead to kidney dysfunction.

【Drinking tea before or after meals】

The tannins and theophylline in tea leaves can affect human digestion. Tannins inhibit the secretion of gastric and intestinal juices, causing indigestion, and can also form indigestible tannin-protein coagulates with proteins in food. Related experiments have also shown that drinking tea brewed with 15 grams of tea leaves after a meal can reduce the absorption of iron in food by 50%. The higher the concentration of tea, the greater the harm to the body. Therefore, it is recommended not to drink tea within one hour before and after meals.

【Taking medication with tea】

Some medications containing iron, aluminum, or enzymes can form combined precipitates when encountering polyphenols in tea, so it is not advisable to take medication with tea. The stimulating effect of caffeine in tea can also conflict with certain sedatives and hypnotics. Therefore, it is generally believed that tea should not be consumed within two hours before and after taking medication.

【Drinking tea on an empty stomach】

Drinking tea on an empty stomach can dilute gastric acid and inhibit the secretion of gastric juices, hindering digestion. It may even cause palpitations, headaches, stomach discomfort, blurred vision, and restlessness, and can affect the absorption of protein, potentially damaging the gastric mucosa and causing chronic gastritis.

【Drinking overnight tea】

When tea leaves are steeped for too long, the beneficial substances (including vitamin C) are greatly reduced. In high temperatures, it is also susceptible to microbial contamination, which does not meet food hygiene standards. Additionally, some tea leaves have excessive lead content, and when steeped for a long time, the lead content in the tea water increases significantly.

【Drinking overly strong tea】

The caffeine content in tea is relatively high, which strongly stimulates the central nervous system of the brain. When a person's excitability increases, their mental activity becomes very active. Especially drinking strong tea before bedtime can affect sleep and even cause insomnia. It is particularly important to point out that the elderly and frail should avoid drinking strong tea, as tea is cold in nature and can invade the spleen and stomach. Over time, it will gradually deplete vitality and may even induce gastrointestinal diseases.