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DNA,人的寿命和年薪之间的关系,你知道吗?

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小编摘要:苏格兰格拉斯哥大学的科学家发现,家庭收入多少可影响DNA端粒的代谢速率,从而影响人的寿命,果真是“富贵有命”。

导读:终其一生,人体DNA端粒都在变短,预示着人变老的速率。以十年为一阶段,那些家庭收入低于2.5万英镑的人,DNA端粒平均变短7.7%,但是对于那些收入更高的人来说,DNA端粒平均只变短0.6%。这说明,社会经济条件可影响人寿命的长短,同时饮食也是影响寿命的一个不可忽视的重要因素。(研究背景为英国,2.5万英镑不是中国人衡量变老速率的标准。)

Scientists in Glasgow have developed a new test of the ageing process based on DNA evidence.

They have said it could provide faster feedback on public health measures.

Until now, evidence of health improvement has involved waiting a generation or more to measure how many people become ill.

Work by the Glasgow Centre for Population Health has confirmed the link between social factors and the rate at which people age.

Their findings have been published in the Public Library of Science.

The scientists measured the length of telomeres, the tails on the ends of chromosomes, in sample groups in the Glasgow area.

The Telomeres tend to become shorter over a person's lifetime, indicating the speed of the ageing process.

The Glasgow researchers found that, over a 10-year period, telomeres shortened by an average of 7.7% in people whose household income was below £25,000. For those on higher incomes, the shortening averaged 0.6%.

Changes in diet

A similar trend in telomere lengths was found in comparisons of those in rented housing with home owners, and of those with the poorest diets and those who ate well.

 Dr Paul Shiels, of the Institute of Cancer Studies at Glasgow University, said: "We show that accelerated ageing is associated with social status and deprivation in Glasgow.

"This is most prevalent in the over-55s and those with household incomes under £25,000.

"This effect is exacerbated by diet - simply not eating your five portions of fruit and veg a day."

The test gives an indication of ageing within population groups, but does not accurately measure the life expectancy of an individual, because of natural differences in telomere length.

Dr Shiels said: "Its value is at a population level, where large numbers of subjects allow us to observe trends over a period of time.

"It is a tool for looking at the impact of changes in diet, for example.

"This study is a first for Glasgow and indicates that socio-economic conditions do affect the rate at which you age."

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2011-07-29 11:10 编辑:Day_Day_Up1990
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