女孩男孩过早的青春期发育,祸从何来?_BEC初级作文

女孩男孩过早的青春期发育,祸从何来?

What factors lie behind this trend? Why are our children reaching biological adulthood at earlier and earlier ages? And what are the medical implications of this? Answers to these questions are still debated, although most scientists and health experts believe that the initial decline in the age in puberty was linked to general improvements in health in the west that began in the late 19th century. The trouble is that this drop, which was expected to stop, has simply continued at the same rate: a decline in four to five months in age of onset for each passing decade.

这一趋势背后的因素是什么？为什么我们的孩子达到生理成熟的年龄越来越早？这一现象的医学暗示是什么？对这些问题的答案仍存在争议，尽管大多数科学家和健康专家认为，在青春期年龄的初始下降与西方19世纪后期开始的健康条件的普遍改善有关。问题在于预计将停止的这个下降，只是还在以同样的速度继续：每10年发育年龄会下降4到5个月。

This relentless slide has begun to worry doctors who have proposed a host of causes to explain it. Increasing obesity is often quoted. In the young it is thought to increase blood levels of oestrogens that promote breast development and early studies seemed to confirm this by linking puberty to higher body mass index. However, a Danish study released last year in the journal Paediatrics found puberty occurring earlier in children regardless of body mass index at age seven.