The ability to devour cakes and chocolate without getting fat may not be as great as it sounds. 

　　可以随心所欲大口吃蛋糕和巧克力，却不会变胖的能力实际上并不怎么样。

    Scientists have shown that people with a fast metabolism don't live as long as those who burn up calories more slowly. 

  　科学家们表示新陈代谢快的人没有那些燃烧卡路里慢的人寿命长。

　　The findings, based on a study of more than 600 volunteers, suggest that an increased metabolic rate actually speeds up the ageing process. 

　　这项发现是在研究了600个志愿者后得出的，并表明新陈代谢速率快实际上会加速衰老。

　　Experiments on animals have shown a strong link between lifespan and metabolic rate. 

　　在动物身上做的实验已经证明了寿命与代谢速率之间有紧密关系。

　　Creatures that burn up energy more quickly tend to have shorter lives than animals that convert food into energy slowly. 

　　燃烧能量快的的动物比那些把食物缓慢转换成能量的动物生存的时间更短。

　　But the findings do not apply to energy burnt up by exercise. 

　　但是这些发现并不适用于通过锻炼而燃烧的能量。

　　This activity clearly has beneficial effects on health. 

　　这项发现很明显对健康有很大好处。

　　And people with a slow metabolism who become fat are also unlikely to benefit because their obesity puts them at greater risk of dying from heart disease, stroke and cancer. 

　　而且代谢速率慢的并变胖的人也不大可能从中受益，因为他们的肥胖会把他们推向因心脏病和中风，癌症而濒临死亡的危险。