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研究显示，在55岁以下的人群中，喝咖啡过多会增加死亡率。
科学家称，因各种原因，这个年龄段的人如果平均每天喝超过4杯咖啡，其死亡风险比平常人要高56%。
Heavy coffee consumption increases death rates in under-55s, study suggests 研究显示，在55岁以下的人群中，喝咖啡过多会增加死亡率 Scientists claim those in age group who drink average of more than four cups of coffee a day are at 56% greater risk of death from all causes 科学家称，因各种原因，这个年龄段的人如果平均每天喝超过4杯咖啡，其死亡风险比平常人要高56%。
The apparently harmful effects of heavy coffee consumption were not seen in older people. Photograph: David Parker/Alamy 这种明显的有害影响在55岁及以上人群中还没有发现。图片来源：David Parker/Alamy Drinking more than four cups of coffee a day can raise the risk of dying from a host of diseases, scientists claim. 科学家称，每天喝超过4杯咖啡会增加因各种疾病死亡的风险。 Researchers in the US found that death rates from all causes rose by more than half in people aged under 55 who drank more than 28 cups a week. 美国的研究人员发现，如果55岁以下的人每周喝超过28杯，其由各种原因导致的死亡率会上升一半多。 The apparently harmful effects of heavy coffee consumption were not seen in older people, according to a study published in the journal Mayo Clinic Proceedings. 该研究成果发表在梅奥医学期刊上（Mayo Clinic Proceedings），其显示过量饮用的明显有害影响在55及以上人群中还没有发现。 The team led by Steven Blair at the University of South Carolina warned that younger people in particular might want to avoid drinking large amounts of coffee. 由南卡罗来纳大学的史蒂文·布莱尔领导的这个研究小组警告称，特别是年轻人应该避免大量喝咖啡。 Previous studies have found conflicting evidence for the impact of coffee on health, with some suggesting it can raise blood pressure, and alter adrenaline and insulin activity in the body, while others point to beneficial effects on the immune system and cognitive performance. 以往的研究发现咖啡对健康的影响相互矛盾：一些表明它会造成血压上升并改变肾上腺素和胰岛素在体内的活性，而一些则指出其可以改善免疫系统和认知力。 For the latest study, researchers analysed medical and personal history questionnaires filled out by more than 40,000 people aged 20 to 87 between 1979 and 1998. After a typical follow-up period of 17 years, more than 2,500 participants had died. 在最新的研究中，研究人员分析了1979年至1998年间由20至87岁的人填写的4000多份医疗和个人历史调查问卷。在典型的17年随访期间，2,500多名参与者去世。 The study found that those who drank larger amounts of coffee were more likely to smoke and had less healthy lungs and hearts. 该研究发现，那些大量饮用咖啡的人更容易吸烟，肺和心脏的健康状况也更差。 Younger men had a greater risk of death even at lower levels of coffee consumption, but the effect only became significant at around 28 cups per week, where the under 55s had a 56% increase in death from all causes. 即使喝的咖啡更少，年轻些的男性死亡风险更大，但这一影响只有在每周喝28杯左右时才会变得明显，这时55岁以下的人因各种原因死亡的风险会增加56%。 The impact of coffee appeared to be more serious on women. Those aged under 55 years old had double the risk of dying from all causes than those who did not drink coffee. 咖啡的这种影响似乎对女性更严重。55岁以下喝咖啡的女性因各种原因死亡的风险比不喝的要高一倍。 Which constituents of coffee may be to blame for the effects are not fully understood. "The exact mechanism between coffee and mortality still needs clarification. Coffee is high in caffeine, which has the potential to stimulate the release of epinephrine, inhibit insulin activity, and increase blood pressure," said Xuemei Sui, a co-author on the study. 哪种咖啡成分可能导致了这一影响目前还未完全清楚。该研究报告的共同作者隋雪梅（Xuemei Sui）说，“咖啡和死亡率之间的确切机制仍然需要弄清楚。咖啡因在咖啡中的含量高，其可能刺激释放肾上腺素、抑制胰岛素活性同时使血压升高。“ The reason the under 55s are most at risk is also uncertain, but related vices, such as heavy drinking, may play a part. "Heavy coffee consumption behaviour might cluster with other unhealthy behaviours such as sleeping late, and eating a poor diet", adds Sui. 55岁以下人群受威胁最大的原因目前还不确定，但相关恶习，如酗酒，可能也起了作用。隋雪梅说，“过量喝咖啡和其它一些不健康行为，如晚睡、吃得差，可能集中起作用。“ Hajra Siraj, a GP in Chelsea and Westminster, said: "Drinking coffee forms a large part of modern living in our society, so it's easy to lose track of how much we're actually consuming, and this study suggests this could have a greater impact on our health than we may realise." 来自切尔西和威斯敏斯特的全科医生Hajra Siraj说，”喝咖啡是现代生活的一大部分，所以很难追踪我们到底喝了多少。现在这项研究告诉我们其对我健康的影响可能比我们先前认识到的要大。“ |
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