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SSS 2009-03-25

时间:2010-05-17 06:54来源:互联网 提供网友:木渐浅。   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute.

Generally speaking, kids do like their candy. Now scientists say that this sweet tooth may have some basis in biology. Because sugars may help fuel the rapid growth of childhood.

Stroll down the cereal aisle1 of your local supermarket, and you’ll no doubt notice that children favor foods that are on the sweet side. But those cravings tend to wane2 as kids reach adolescence3. To find out why, researchers took 143 children, ages 11 to 15, and assessed their preference for sweetness by having them “sip and spit” shots of sugar water. They then separated the kids into two groups, one with a high preference for sweets, and the other with a low preference.

What they found is that the kids who really like their sugar were growing faster than the kids who said that the syrup4 samples were just too sweet. The sugar fiends had higher blood concentrations of a biomarker associated with bone growth, findings that appear in the March 23rd issue of the journal Physiology5 & Behavior. And in case you were wondering, the drop-off in sugar-liking did not correlate with the onset6 of puberty. So it’s really the tapering7 off of growth that makes kids decide that candy’s no longer dandy.

Thanks for the minute for Scientific American's 60-Second Science. I'm Karen Hopkin
 


点击收听单词发音收听单词发音  

1 aisle qxPz3     
n.(教堂、教室、戏院等里的)过道,通道
参考例句:
  • The aisle was crammed with people.过道上挤满了人。
  • The girl ushered me along the aisle to my seat.引座小姐带领我沿着通道到我的座位上去。
2 wane bpRyR     
n.衰微,亏缺,变弱;v.变小,亏缺,呈下弦
参考例句:
  • The moon is on the wane.月亮渐亏。
  • Her enthusiasm for him was beginning to wane.她对他的热情在开始减退。
3 adolescence CyXzY     
n.青春期,青少年
参考例句:
  • Adolescence is the process of going from childhood to maturity.青春期是从少年到成年的过渡期。
  • The film is about the trials and tribulations of adolescence.这部电影讲述了青春期的麻烦和苦恼。
4 syrup hguzup     
n.糖浆,糖水
参考例句:
  • I skimmed the foam from the boiling syrup.我撇去了煮沸糖浆上的泡沫。
  • Tinned fruit usually has a lot of syrup with it.罐头水果通常都有许多糖浆。
5 physiology uAfyL     
n.生理学,生理机能
参考例句:
  • He bought a book about physiology.他买了一本生理学方面的书。
  • He was awarded the Nobel Prize for achievements in physiology.他因生理学方面的建树而被授予诺贝尔奖。
6 onset bICxF     
n.进攻,袭击,开始,突然开始
参考例句:
  • The drug must be taken from the onset of the infection.这种药必须在感染的最初期就开始服用。
  • Our troops withstood the onset of the enemy.我们的部队抵挡住了敌人的进攻。
7 tapering pq5wC     
adj.尖端细的
参考例句:
  • Interest in the scandal seems to be tapering off. 人们对那件丑闻的兴趣似乎越来越小了。
  • Nonproductive expenditures keep tapering down. 非生产性开支一直在下降。
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