And then the most surprising thing of all was a study done not long ago,

不久前的实验中让人惊奇的事发生了
published in 1997 of registered dieticians.

在1997年由注册营养学家发表
So registered dieticians--

注册营养学家
and these are folks that are trained in nutrition,

他们受专业营养学培训
they're the ones who are certified to know a lot about nutrition,

被证明拥有大量营养学知识
they do dietary counseling with individuals for the most part,

他们为个人进行营养咨询
telling them about portions, and calories,

告诉人们关于每日摄入量和卡路里
and nutrients and things like that,

以及营养素等
so you'd think these folks would know a lot--

所以人们认为营养学家们懂得很多
they were asked to estimate the calories in, again common foods,

当他们被要求估算普通食物卡路里时
lasagna, hamburger with onion rings, tuna sandwich, etc.

像意面洋葱圈汉堡金枪鱼三明治
And what they found was they underestimated by 200-600 calories,

结果营养学家们把这些食物的卡路里