久久亚洲国产成人影院-久久亚洲国产的中文-久久亚洲国产高清-久久亚洲国产精品-亚洲图片偷拍自拍-亚洲图色视频

您現(xiàn)在的位置: Language Tips> Easy English> Odd Question  
 





 
我們?yōu)槭裁磿?huì)發(fā)胖?
[ 2007-04-25 11:41 ]

人為什么會(huì)發(fā)胖?比較常見(jiàn)的說(shuō)法是我們攝入的脂肪高于消耗掉的脂肪,所以就發(fā)胖了。但是一項(xiàng)新的研究似乎找到了更科學(xué)的原因。想要減肥的人們要注意看啦!

The discovery of the obesity gene in humans half a decade ago offered evidence that chronic weight gain is the consequence of a mismatch between nature and nurture. Simplistic explanations, such as blaming obesity on a drop in fat consumption, ignore scientific reality. In countries like India and China, obesity was virtually unknown until the introduction of a high-fat, western-style diet.

One well-known reason for this is that dietary fatconverts tobody fat more efficiently than does protein or carbohydrate, but recently scientists have uncovered what appears to be an equally important factor. Some researchers in universities are investigating the possibility that high levels of fat and fructose aremucking upour brain chemistry, and thereby muting the signals that would normally tell us to put down the fork. These signals are produced by peptides, which are regulated by a number of hormones. Under normal conditions these hormones help maintain a stable body weight by adjusting levels of the peptides that control eating. But a diet loaded with fat and fructose hampers the regulation of these hormones. Complicating matters still further is that the brain loses its ability to respond to these hormones as body fat increases -- so the obese are doubly penalized.

Other researchers are finding evidence that constant exposure to fat and sugar can cause some humans tocravethem as they do an addictive drug. A Princeton University psychologist recently showed that rats fed a high sugar diet were, when the sugar was removed, thrown into a state of anxiety similar to that seen in withdrawal from morphine or nicotine. Sarah Leibowitz, a neurobiologist, believes that frequent exposure to fatty foods may configure the brain to crave still more fat. She has shown in animal studies that galanin, a brain peptide that simulates eating behavior and decreases energy expenditure, increases when the animal eats a high-fat diet.

There are many factors contributing to the explosion of obesity in the United States, and the world, but the radical changes in the composition of our diet are first among them. While scientific work in this area is in its infancy, it's already clear that varying the amount of fat and other nutrients in the diet affects brain chemistry by activating certain genes, and this in turn directs our dietary preferences. By submitting ourselves to a steady dose of highly processed, sweet, high-fat foods, we have unwittingly entered into a dangerous experiment, the long term consequences of which are only now beginning to surface.

converts to: 轉(zhuǎn)換為

muck up: 擾亂

crave: 渴望

(來(lái)源:英語(yǔ)閱讀網(wǎng) 實(shí)習(xí)生江巍)

 
 
相關(guān)文章 Related Stories
 
 
 

本頻道最新推薦

     
  為什么下雪時(shí)天氣暖
  You are the smartest fish I've ever seen!
  Dog burger
  為什么老了脾氣好
  飛蛾為什么撲火

論壇熱貼

     
  開(kāi)個(gè)題目大家扯:hotel & restaurant
  追求某人
  請(qǐng)教工商年檢如何翻譯
  How to translate “中國(guó)老字號(hào)”into English?
  "港股直通車(chē)"怎么翻譯?
  兩免一補(bǔ)怎么說(shuō)?




主站蜘蛛池模板: 国产精品午夜性视频 | 亚州三级 | 国产精品久久久免费视频 | 一本久久a久久精品亚洲 | 国产a免费观看 | 美国毛片毛片全部免费 | 激情6月丁香婷婷色综合 | 成年女人看片免费视频频 | 成人午夜视频免费观看 | 欧美精品人爱a欧美精品 | 日韩日韩日韩手机看片自拍 | 国产一区二区三区免费在线观看 | 欧美在线视频看看 | 国产a级精品特黄毛片 | 国产成人在线视频 | 日本网址在线观看 | 女同日韩互慰互摸在线观看 | 亚洲自拍在线观看 | 日韩三级在线观看 | 日本一级毛片片在线播放 | 99在线观看精品免费99 | 亚洲成成品网站有线 | 99久久免费精品国产免费高清 | 国产午夜精品一区二区三区不卡 | 国产精品v在线播放观看 | 日本一区二区三区四区不卡 | 波多野结衣在线中文 | 国产乱子伦片免费观看中字 | 亚洲精品国产免费 | 男女男精品视频免费观看 | 国产a级高清版毛片 | 黄网在线免费 | 久久精品国产在爱久久 | 亚洲免费三级 | 久久精品亚洲乱码伦伦中文 | 日本不卡在线一区二区三区视频 | 99视频在线| 欧美精品一区二区在线观看 | 台湾香港澳门三级在线 | 久久99精品久久只有精品 | 男吃女下面刺激视频免费 |