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SSS 2008-03-27

时间:2010-05-13 05:54来源:互联网 提供网友:0922013129   字体: [ ]
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This is Scientific American's 60-Second Science. I am Cynthia Graber. This will just take a minute.

Brains can register a food’s caloric value independent of our taste buds, say scientists from Duke University and from Portugal. First the scientists engineered mice without taste receptors for sweets. They compared the so-called sweet-blind mice to normal mice. Both were offered plain water or water with sucrose. And within about ten minutes, even the sweet-blind mice preferred the sugar water. The same test was repeated with sucrose, a calorie-free sweetener. The mice that could taste the sweetener preferred it, but the mice without the taste receptors never developed a preference for the fake stuff. Then the researchers looked at the brains of the sweet-blind mice. Sucrose turned on neurons in the brain’s food reward system. And the brain chemical dopamine was elevated. Dopamine is a crucial part of the brain’s reward circuitry. These changes show that the brain’s reward system can detect internal physiological1 changes even independent of taste, maybe through the digestive system. The work appears in the March 27 issue of the journal Neuron. Scientists are calling this nutrient2 awareness3 the brain’s sixth sense for calories. They say teasing out these mechanisms4 could have implications in understanding and combating obesity5.

 

Thanks for the minute for Scientific American's 60-Second Science. I'm Cynthia Graber.
 


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1 physiological aAvyK     
adj.生理学的,生理学上的
参考例句:
  • He bought a physiological book.他买了一本生理学方面的书。
  • Every individual has a physiological requirement for each nutrient.每个人对每种营养成分都有一种生理上的需要。
2 nutrient 3vpye     
adj.营养的,滋养的;n.营养物,营养品
参考例句:
  • Magnesium is the nutrient element in plant growth.镁是植物生长的营养要素。
  • The roots transmit moisture and nutrient to the trunk and branches.根将水分和养料输送到干和枝。
3 awareness 4yWzdW     
n.意识,觉悟,懂事,明智
参考例句:
  • There is a general awareness that smoking is harmful.人们普遍认识到吸烟有害健康。
  • Environmental awareness has increased over the years.这些年来人们的环境意识增强了。
4 mechanisms d0db71d70348ef1c49f05f59097917b8     
n.机械( mechanism的名词复数 );机械装置;[生物学] 机制;机械作用
参考例句:
  • The research will provide direct insight into molecular mechanisms. 这项研究将使人能够直接地了解分子的机理。 来自《简明英汉词典》
  • He explained how the two mechanisms worked. 他解释这两台机械装置是如何工作的。 来自《简明英汉词典》
5 obesity Dv1ya     
n.肥胖,肥大
参考例句:
  • One effect of overeating may be obesity.吃得过多能导致肥胖。
  • Sugar and fat can more easily lead to obesity than some other foods.糖和脂肪比其他食物更容易导致肥胖。
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TAG标签:   SSS  caloric
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