Drinking tea is not only refreshing, but also rich in many healthy substances. Tea polyphenols in tea have antioxidant effect and can soften blood vessels, which is very beneficial to cardiovascular and cerebrovascular diseases.
Tea contains a lot of tannic acid. If people often drink strong tea, the combination of tannic acid and iron will form insoluble matter, which will hinder the absorption of iron. Drinking strong tea for a long time can lead to iron deficiency anemia.
Drinking strong tea after meals is more harmful. Because iron, vitamins and other essential substances are usually ingested in the daily diet, food is still in the stomach after a full meal. At this time, when drinking strong tea, tannic acid is more likely to combine with iron, which hinders the absorption of iron. For people with iron deficiency anemia, they should drink less strong tea.
Excessive drinking of strong tea and theophylline repeatedly stimulates gastric mucosa. It is also easy to cause gastritis and ulcers, and may also cause tumors.
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