當你節(jié)食時，你的身體是如何反擊的？

當你節(jié)食時，你的身體是如何反擊的？

Diets do not work.

節(jié)食不起作用。

The scientific evidence is clear as can be that cutting calories simply doesn't lead to long-term weight loss or health gains.

科學證據(jù)很清楚，減少熱量攝入并不會導致長期的體重減輕或健康狀況改善。

We suspect most dieters have realized this by now too. And yet, here they are again, setting the same weight loss goal this year that they set last year.

我們懷疑大多數(shù)節(jié)食者現(xiàn)在也意識到了這一點。然而，他們又一次制定了和去年一樣的減肥目標。

The only people who don't seem to appreciate this are people who have never dieted. It's particularly hard for them to believe because it doesn't square with their own eating experiences.

似乎只有從未節(jié)食的人才不明白這一點。尤其讓他們難以置信的是，這與他們自己的飲食經(jīng)歷不符。

Take Nicky, for instance. She eats sensibly much of the time, with some junk food here and there, but it doesn't really seem to affect her weight. She's not a dieter. She is naturally thin , and it's not surprising that she believes what she sees with her own eyes and feels in her own body. Nevertheless, Nicky has it wrong.

以尼基為例。她大部分時間都吃得很理智，偶爾吃點垃圾食品，但這似乎并沒有真正影響她的體重。她不是節(jié)食者。她天生就很瘦，所以她相信自己的眼睛和身體的感覺也就不足為奇了。然而，尼基錯了。

We are researchers who have been studying why diets fail for a long time. We have seen that diet failure is the norm. We have also studied the stigma that heavy people face, and witnessed the blame game that happens when dieters can't keep the weight off. From a scientific perspective, we understand that dieting sets up an unfair fight. But many Nickys we've encountered -- on the street, in the audience when we give talks, and even fellow scientists -- get confused when we say dieting doesn't work, because it doesn't square with their own observations.

我們這些研究人員長期以來一直在研究為什么節(jié)食會失敗。我們已經(jīng)看到節(jié)食失敗是一種常態(tài)。我們還研究了體重超標的人所面臨的恥辱，并目睹了節(jié)食者無法保持體重時所發(fā)生的指責。從科學的角度來看，我們明白節(jié)食會引發(fā)一場不公平的斗爭。但是我們遇到的許多尼基人——在街上，在我們演講的時候的聽眾中，甚至是我們的科學家同行——當我們說節(jié)食不起作用時，他們會感到困惑，因為這與他們自己的觀察不相符。

An unfair fight

一個不公平的抗爭

Nicky thinks she's thin because of the way she eats, but actually, genetics play a huge role in making her thin. Nicky gets all the credit though, because people see the way she eats and they can't see her genes.

尼基認為她瘦是因為她吃東西的方式，但實際上，基因在使她瘦的過程中發(fā)揮了巨大的作用。尼基得到了所有的贊譽，因為人們看到了她的飲食方式，卻看不到她的基因。

Many heavy people wouldn't be lean like Nicky even if they ate the same foods in the same quantities. Their bodies are able to run on fewer calories than Nicky's, which sounds like a good thing (and would be great if you found yourself in a famine).

許多肥胖的人不會像尼基一樣瘦，即使他們吃同樣數(shù)量的食物。他們的身體比尼基的消耗更少的卡路里，這聽起來像是一件好事(如果你發(fā)現(xiàn)自己陷入了饑荒，那就太好了)。

However, it actually means that after eating the same foods and using that energy to run the systems of their body, they have more calories left over to store as fat than Nicky does. So to actually lose weight, they have to eat less food than Nicky. And then, once they've been dieting a while, their metabolism changes so that they need to eat even less than that to keep losing weight.

然而，這實際上意味著，在吃了同樣的食物，并利用這些能量來運行身體系統(tǒng)之后，他們比尼基有更多的卡路里作為脂肪儲存起來。所以，為了真正減肥，他們必須比尼基吃更少的食物。然后，一旦他們節(jié)食了一段時間，他們的新陳代謝就會發(fā)生變化，所以他們需要吃得更少才能持續(xù)減肥。

It's not just Nicky's genetically given metabolism that makes her think dieting must work. Nicky, as a non-dieter, finds it really easy to ignore that bowl of Hershey's Kisses on her co-worker's desk. But for dieters, it's like those Kisses are jumping up and down saying "Eat me!" Dieting causes neurological changesthat make you more likely to notice food than before dieting, and once you notice it, these changes make it hard to stop thinking about it. Nicky might forget those chocolates are there, but dieters won't.

尼基認為節(jié)食必須奏效，并不僅僅是因為基因決定的新陳代謝。尼基是個非節(jié)食者，她發(fā)現(xiàn)自己很容易忽視同事桌上那碗好時(Hershey)的熱吻。但對于減肥者來說，這就像那些吻跳上跳下說“吃了我!”節(jié)食會引起神經(jīng)系統(tǒng)的變化，使你比節(jié)食前更容易注意到食物，一旦你注意到了，這些變化就會使你很難停止思考。尼基可能會忘記巧克力的存在，但節(jié)食者不會。