弄清减肥的真相
文章来源:未知 文章作者:meng 发布时间:2010-01-07 01:31 字体: [ ]  进入论坛
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It's time to set the record straight. The only reliable way to lose weight is to eat less or exercise more. Preferably更适宜,较好 both. So why bother to state the obvious? Because a body of scientific literature has arisen over recent years, suggesting that fat oxidation氧化 – burning the fats we eat as opposed to the carbohydrates碳水化物 – is enough to promote fat loss. It isn't.

Sydney scientists have demonstrated that mice genetically2 altered to burn fats in preference to优先于 carbohydrates1, will convert the unburned carbohydrates into stored fat anyway, and their ultimate weight and body composition will be the same as normal mice.

It all comes down to an enzyme酶 known as ACC2 (acetyl-CoA carboxylase碳酸醇素), which controls whether cells burn fats or carbohydrates. When it was shown that 'blocking' ACC2 will force cells to burn fats in preference to carbohydrates, many assumed that such 'fat burning' could make fat stores evaporate蒸发,挥发, and make people thin without changing food intake食物摄取 or energy expenditure能量消耗.

Associate Professor Greg Cooney, from Sydney's Garvan Institute of Medical Research, discusses misconceptions迷思概念,错误的想法 surrounding ACC2 in findings that appear in the prestigious有名望的 international journal, Cell Metabolism7, online today.

"Our data urges a correction in people's concept of a magic bullet - something that will miraculously8 make them thin while they sit on the couch watching television," said Professor Cooney.

"While none of the large pharmaceutical9 companies have marketed ACC2 inhibitors, there are many kinds of so-called 'fat-burning pills' available in the health food, body building and alternative medicine markets, where limited clinical effectiveness data are required."

"Many such products can also contain potentially harmful stimulants10 or come with a recommendation to follow a calorie-controlled diet and do more exercise while taking them. If you follow those recommendations, then of course you'll lose weight - but you'd lose it anyway."

"The energy you use in your home can come from a coal-fired power station, hydroelectric power水力发电, or a wind turbine风力涡轮机. You won't know which because the end result is electricity."

"The energy that fuels your body can come from fats, proteins or carbohydrates. You won't know which because the end result is ATP, or cellular11 energy."

"Your body will use the energy it needs and store the leftover12 fats, proteins or carbohydrates as fat. When you do the sums, it's ultimately a matter of calories in and calories out."

"It's important to stress that the focus of our study was limited to an analysis of the impact of fat oxidation on overall fatness. We didn't investigate all impacts of fat oxidation – and so we don't rule out benefits of burning off fats in specific tissues."

"For example, manipulating fat metabolism脂肪代谢 may - or may not - lead to better insulin胰岛素 action in muscles or in the liver. Should insulin action be improved, that would obviously benefit obese13肥胖的 people with Type 2 diabetes14. But we can't comment either way until we do the experiments."

And the take-home message? Follow a healthy, balanced diet and get plenty of exercise.



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1 carbohydrates 001f0186d1ea717492c413ca718f2635     
n.碳水化合物,糖类( carbohydrate的名词复数 );淀粉质或糖类食物
参考例句:
  • The plant uses the carbohydrates to make cellulose. 植物用碳水化合物制造纤维素。 来自《简明英汉词典》
  • All carbohydrates originate from plants. 所有的碳水化合物均来自植物。 来自辞典例句
2 genetically Lgixo     
adv.遗传上
参考例句:
  • All the bees in the colony are genetically related. 同一群体的蜜蜂都有亲缘关系。
  • Genetically modified foods have already arrived on American dinner tables. 经基因改造加工过的食物已端上了美国人的餐桌。 来自英汉非文学 - 生命科学 - 基因与食物
3 enzyme cPozF     
n.酵素,酶
参考例句:
  • Above a certain temperature,the enzyme molecule will become unfolded.超过一定温度,酶分子将会展开。
  • An enzyme that dissolves the fibrin of blood clots.能溶解血凝块中的纤维的酶。
4 intake 44cyQ     
n.吸入,纳入;进气口,入口
参考例句:
  • Reduce your salt intake.减少盐的摄入量。
  • There was a horrified intake of breath from every child.所有的孩子都害怕地倒抽了一口凉气。
5 expenditure XPbzM     
n.(时间、劳力、金钱等)支出;使用,消耗
参考例句:
  • The entry of all expenditure is necessary.有必要把一切开支入账。
  • The monthly expenditure of our family is four hundred dollars altogether.我们一家的开销每月共计四百元。
6 prestigious nQ2xn     
adj.有威望的,有声望的,受尊敬的
参考例句:
  • The young man graduated from a prestigious university.这个年轻人毕业于一所名牌大学。
  • You may even join a prestigious magazine as a contributing editor.甚至可能会加入一个知名杂志做编辑。
7 metabolism 171zC     
n.新陈代谢
参考例句:
  • After years of dieting,Carol's metabolism was completely out of whack.经过数年的节食,卡罗尔的新陈代谢完全紊乱了。
  • All living matter undergoes a process of metabolism.生物都有新陈代谢。
8 miraculously unQzzE     
ad.奇迹般地
参考例句:
  • He had been miraculously saved from almost certain death. 他奇迹般地从死亡线上获救。
  • A schoolboy miraculously survived a 25 000-volt electric shock. 一名男学生在遭受2.5 万伏的电击后奇迹般地活了下来。
9 pharmaceutical f30zR     
adj.药学的,药物的;药用的,药剂师的
参考例句:
  • She has donated money to establish a pharmaceutical laboratory.她捐款成立了一个药剂实验室。
  • We are engaged in a legal tussle with a large pharmaceutical company.我们正同一家大制药公司闹法律纠纷。
10 stimulants dbf97919d8c4d368bccf513bd2087c54     
n.兴奋剂( stimulant的名词复数 );含兴奋剂的饮料;刺激物;激励物
参考例句:
  • Coffee and tea are mild stimulants. 咖啡和茶是轻度兴奋剂。
  • At lower concentrations they may even be stimulants of cell division. 在浓度较低时,它们甚至能促进细胞分裂。 来自辞典例句
11 cellular aU1yo     
adj.移动的;细胞的,由细胞组成的
参考例句:
  • She has a cellular telephone in her car.她的汽车里有一部无线通讯电话机。
  • Many people use cellular materials as sensitive elements in hygrometers.很多人用蜂窝状的材料作为测量温度的传感元件。
12 leftover V97zC     
n.剩货,残留物,剩饭;adj.残余的
参考例句:
  • These narrow roads are a leftover from the days of horse-drawn carriages.这些小道是从马车时代沿用下来的。
  • Wonder if that bakery lets us take leftover home.不知道那家糕饼店会不会让我们把卖剩的带回家。
13 obese uvIya     
adj.过度肥胖的,肥大的
参考例句:
  • The old man is really obese,it can't be healthy.那位老人确实过于肥胖了,不能算是健康。
  • Being obese and lazy is dangerous to health.又胖又懒危害健康。
14 diabetes uPnzu     
n.糖尿病
参考例句:
  • In case of diabetes, physicians advise against the use of sugar.对于糖尿病患者,医生告诫他们不要吃糖。
  • Diabetes is caused by a fault in the insulin production of the body.糖尿病是由体內胰岛素分泌失调引起的。
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