如果说养育孩子的艰辛是做母亲必须付出的代价,还有一个代价是母亲们不得不面对的,那就是老得更快。新研究发现,生过孩子的女性在生理上会比没生过孩子的女性更老。生过孩子的女性DNA端粒更短,这意味着细胞寿命更短。
Women who give birth may be biologically "older" than women who don't, a new study suggests.
一项新研究发现,生过孩子的女性在生理上会比那些没有生过的“更老”。
For the study, the researchers analyzed information from 1,556 US women ages 20 to 44 who took part in a national survey from 1999 to 2002, which involved giving blood samples.
在该研究中,研究人员们分析了20-44岁之间的1556名美国女性信息,她们参加了1999年至2002年期间的全国调查,并给出了血 液样本。
The researchers looked at the genetic material inside the women's cells, specifically the length of their telomeres. These are caps on the ends of chromosomes that protect the chromosomes from damage. Telomeres naturally shorten as people age, but the structures don't shorten at the same rate in every person. The longer a person's telomeres are, the more times their cells could hypothetically still divide, research has shown. Thus, telomeres are considered a marker of biological age — that is, the age of a person's cells, rather than the individual's chronological age.
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