Coffee and tea can not be drunk together, it has the following consequences: 1, coffee and tea have some of the same substances, will reduce the absorption of calcium, and induce hypocalcemia; 2, coffee and tea will reduce the absorption of iron, resulting in anemia, especially for a long time; 3, both can make gastric attack, especially prone to gastritis, gastric ulcer and some other related diseases; 4, Drinking the two together, the role of superposition, it is easy to lead to insomnia; 5, coffee and tea itself contains a lot of water, after ingestion of the body, will lead to imbalance in the body’s acid-base balance, and some related symptoms. So coffee and tea in the clinical do not drink at the same time, you can choose one of them, and the concentration is not too large.