Coffee and tea are not recommended to drink together. Coffee and tea contain caffeine, which can excite the central nervous system, refresh the brain, trigger insomnia, or may aggravate the body and cause other symptoms of discomfort. Coffee and tea together, the possible effects on the body mainly include the following: 1, the impact on the nervous system: coffee and tea in the caffeine can excite the central nervous system, drinking together may cause excessive excitement, and even cause insomnia. Especially the neurasthenia of the people who drink the two together, insomnia symptoms may be more pronounced. In addition, coffee and tea together may also make the sympathetic nerves abnormally excited, may appear elevated blood pressure, panic, and even induce arrhythmia; 2, the impact on the gastrointestinal tract: coffee and tea in the caffeine can promote gastric acid secretion, excessive secretion of gastric acid, may stimulate the mucosa of the gastrointestinal tract, nausea, vomiting and other uncomfortable symptoms, increasing the risk of gastritis, gastric ulcer, duodenal ulcer and other diseases; 3. Other effects on the body: coffee and tea in the caffeine, tannic acid and other substances, can be combined with calcium and iron in the body, the formation of insoluble substances, long-term drinking together may also cause hypocalcemia or anemia and other diseases. Therefore, coffee and tea are not recommended to drink together, if you especially want to drink coffee, and especially want to drink tea, you can interval a certain amount of time, and the amount should not be too large, so as not to cause adverse effects on the body.