People often drink a cup of hot tea after a meal when they gather in a hotel. Many people also believe that drinking strong tea after a full meal, can play a refreshing effect in addition to the lack of alcohol, to eliminate the feeling of fullness also has a certain role. But do not drink tea too thick, drinking time also has restrictions, should not drink on an empty stomach, can not drink after a meal. Because the human body must be iron, protein, vitamins and other substances usually ingested in the daily diet, and tea contains a large amount of tannic acid, after a full meal food is still in the stomach, then drink strong tea, tea and food mixed, after drinking a lot, tannic acid and iron combined to form an insoluble substance, hinder the absorption of iron, if often drink strong tea after meals, can cause the human body iron deficiency, if the human body long-term iron deficiency, can cause iron deficiency anemia.