1, causing stomach upset: drinking a lot of strong tea often will make the body feel uncomfortable, which will easily dilute the gastric juice, leading to a series of gastrointestinal diseases such as indigestion and bloating.

2, easy to constipation: Long-term drinking tea will combine tannic acid in tea with iron in the body, and it will also combine with protein in food to generate indigestible protein fragments of tannic acid, leading to poor gastrointestinal motility and constipation in the body.

3, affecting the body's absorption of iron: because tea contains tannic acid, and this substance will combine with iron after entering the body, which will have an impact on the body's absorption of iron. Most people who drink tea for a long time will have iron deficiency anemia.

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