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

您現在的位置: > Language Tips > Easy English > Odd Question  
 





 
我們為什么會發胖?
[ 2007-04-25 11:41 ]

人為什么會發胖?比較常見的說法是我們攝入的脂肪高于消耗掉的脂肪,所以就發胖了。但是一項新的研究似乎找到了更科學的原因。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 fat converts to body 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 are mucking up our 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 to crave them 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: 轉換為

muck up: 擾亂

crave: 渴望

(來源:英語閱讀網 實習生江巍)

 
 
相關文章 Related Stories
 
為什么頭發有直有曲 為何失戀后很難再愛一次
牛奶真能補鈣嗎? 真的有一見鐘情嗎?
         
 
 
 
 
 
         
 
 

48小時內最熱門

     

本頻道最新推薦

     
  Bad performance!
  為什么頭發有直有曲
  為何失戀后很難再愛一次
  The best sweater
  牛奶真能補鈣嗎?

論壇熱貼

     
  groovedog的原創音樂
  English etiquette
  請問"萬能膠水"怎么翻?
  "百善孝為先,行孝當及時"用英語怎么說?
  請問‘三九天’英文怎么說
  What do I feel about Canada






主站蜘蛛池模板: 美女叉开腿让男人捅 | 免费国产a国产片高清不卡 免费国产不卡午夜福在线 免费国产不卡午夜福在线观看 | 午夜性刺激免费视频 | 国产精品日产三级在线观看 | 久9久9精品视频在线观看 | 欧美一级日韩一级 | 亚洲精品一级一区二区三区 | 欧美一级毛片怡红院 | 99超级碰碰成人香蕉网 | 国产系列在线 | 免费午夜扒丝袜www在线看 | 99精品国产在现线免费 | 亚洲精品推荐 | 亚洲免费大全 | 国产成人综合亚洲欧美在 | 国产一区二区在线免费观看 | 精品在线播放 | 国产在线不卡视频 | 一级毛片免费不卡夜夜欢 | 欧美片欧美日韩国产综合片 | 美女擦逼 | 亚洲日本久久一区二区va | 婷婷丁香花麻豆 | 成人免费视频网 | freesexvideo性欧美tv2021 | 综合色久七七综合七七蜜芽 | 欧美精品成人一区二区在线观看 | 久久精品a一国产成人免费网站 | 97视频免费公开成人福利 | 久久国产精品一国产精品 | 亚洲精品国产国语 | 视频一区亚洲 | 亚洲欧美日韩在线观看二区 | a级毛片免费完整视频 | 免费公开视频人人人人人人人 | 日韩美女免费线视频 | 亚洲成a人片在线看 | 午夜一级毛片不卡 | 免费观看一级特黄欧美大片 | 99久久免费中文字幕精品 | 久久久亚洲精品蜜桃臀 |