肺癌

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    过去曾流传喝了隔夜茶要的癌症，这是缺乏科学根据的。

    首先隔夜茶的概念和放置时间较长的茶水很难区别。早晨泡的茶下午喝是很常见的情况，有谁会因此而得了癌症呢？夜里工作时泡的茶，早上起床后喝，茶汤中发生的变化不会比白天更大。如果说会发生什么变化的话，也不过是夜里气温低，变化小，白天气温高，变化可能会大些。
    茶水放置时间长了，会发生一些变化。研究表明，主要的变化是茶多酚的进一步氧化，颜色加深。一杯清澈碧绿的茶汤，尤其是在气温较高的情况下时间放长了，会失去绿色，增加黄的程度。据研究这种深色的酚类氧化物无毒且不会致癌。有人推测，茶水放过夜后，会产生亚硝胺，亚硝胺是致癌物质。首先，应该肯定。茶叶中即使有亚硝胺，也是微不足道的，与我们经常食用的主食面包、鱼制品、肉制品、腌菜和腌腊制品等相比，简直是小巫见大巫。谁也没有说吃了肉制品会得癌症。每公斤肉制品中的亚硝胺含量有4—50微克，那不是很可怕吗？其实不然，人体也有分解亚硝胺的功能。再说，亚硝胺要达到每千克体重吸收100—200微克才有可能致癌。一般正常的进食量，不可能达到这样大的剂量。喝茶的数量与下肚的饭菜数量相比，也是微不足道的，因此，担心喝茶会带来亚硝胺的危害，是毫无道理的。
    另外，据研究，茶叶中含有丰富的茶多酚和维生素C，它们都是亚硝胺的天然抑制剂，因此喝茶还能消除其他含有亚硝胺食物带来的危害。比如说，你吃了熏鱼、腌腊制品、腌菜等，不妨餐后喝上一杯茶，这对你的身体健康将是有利的。
    综上所述，隔夜茶或是冲泡后放置了一段时间的茶水，只要没有变质，是没有毒害作用的。当然，在温度较高的夏天，茶汤的放置时间长了会发馊变质。这种变了质甚至长了霉菌的茶水，与其他变质饮料一样，也是不宜饮用的。
    总之，隔夜茶如果没有变质，是可以饮用的。如果发生异变则不宜饮用，因此能否喝隔夜茶应视茶质变化而定。任何饮料食品都以新鲜为好，茶也不例外，随泡随喝，不仅香气浓郁，茶味甘醇，还可减少污染。

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==== 汉译英 ====

Geye Cha drinking in the past to spread the cancer, which is lack of scientific basis.
    First Geye Cha concept and put the tea longer difficult to distinguish. Morning, afternoon tea bubble drink is a very common situation, who would it be cancer? Night work, bubble tea, the morning after getting up to drink tea in the changes that have occurred will not be greater than during the day. If we say what changes will happen then is nothing but a low temperature at night, change is small, daytime high temperatures, changes may be larger. Place tea a long time, some changes will occur. Studies have shown that the main change is the further oxidation of tea polyphenols, color deepened. A cup of clear, green tea, especially in the case of high temperatures put a long time, and will lose the green, increasing yellow level. According to the research of this dark-colored non-toxic and will not cause cancer phenolic oxides. Some people speculate that tea and let the Night, will produce nitrosamines, N-nitrosamines are carcinogenic. First of all, it should be affirmed. Even if there nitrosamines in tea is negligible, and we often eat the staple food, bread, fish products, meat products, pickles, and Curing products such as compared to simply pale into insignificance. No one has said that eating meat will get cancer. Per kilogram of meat products are 4-50 micrograms of nitrosamines, it is not very frightening? In actual fact, the human body also has the function of volatile nitrosamines. Furthermore, nitrosamines per kg body weight to achieve the absorption of 100-200 micrograms possible carcinogen. Normal food intake, it is impossible to reach such a large dose. The number and Xiadu tea compared to the number of meals is also negligible, therefore, concerned that tea will bring harm nitrosamines is totally justified.
    In addition, according to research, tea is rich in polyphenols and vitamin C, they are a natural inhibitor of nitrosamine, so drinking tea can bring about the elimination of other foods containing nitrosamines harm. For example, you eat the smoked fish, Curing products, pickles, etc., we might drink a cup of tea after the meal, which is your physical health will be beneficial.
    To sum up, Geye Cha, or placed for some time after brewing of tea, as long as there is no corruption, there is no toxic effect. Of course, in high summer temperatures, tea placed a long time will be granted rancid degenerate. This change has been a qualitative and even longer mold of tea, and other metamorphic beverages, just as not drinking.
    In short, Geye Cha If there is no corruption, they can drink. If the mutation occurs is not suitable for drinking, so drink Geye Cha whether changes should be determined depending on the quality of tea. Any drink foods fresh to be good, tea is no exception, with the bubble with the drink, not only the aroma, sweet tea flavor, but also reduce pollution.