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过浓的茶。过浓的茶汤里咖啡碱含量相对较高,可导致精神过度兴奋,引起神经正常功能失调,尤其是在晚上,会影响睡眠。饮过浓的茶可使心跳加快、胃酸分泌过多,对于心动过速、早搏和心房纤颤的冠心病患者,以及胃溃疡、十二指肠溃疡患者都是很不利的。烫茶。烫茶对咽喉、食管刺激太大,若长期饮烫茶,高温反复刺激咽喉和食管,可产生慢性热损伤的致癌后果。焦味茶。有焦糊味的茶叶,往往是由于在制作过程中操作不当,茶叶被烤焦或烧焦。焦味茶叶里含有较多的苯并芘致癌物质。
Thick tea. Over-concentrated tea caffeine content is relatively high, can lead to over-excited spirit, causing nerve dysfunction, especially in the evening, will affect sleep. Drink thick tea can make rapid heartbeat, excessive gastric acid secretion, for tachycardia, premature beats and atrial fibrillation in patients with coronary heart disease, as well as gastric ulcer, duodenal ulcer patients are very unfavorable. Hot tea. Hot tea on the throat, esophageal irritation is too large, if long-term hot drink tea, high temperature repeatedly stimulate the throat and esophagus, can have a chronic thermal injury of the cancer consequences. Coke flavor tea. Taste of tea leaves, often due to improper operation in the production process, the tea was scorched or scorched. Burning tea contains more benzopyrene carcinogen.