来自《耶鲁大学开放课程：有关食物的心理学、生物学和政治学 第20集 第20集》

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  if instead of letting them decide whether or not to take it?
  而是直接放在他们的盘子里
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  If the people working there basically put it on their tray
  或者告诉他们一定要吃这些
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  and or told them they needed to take it,
  情况又会是如何呢
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  so that when they left--when they walked out of the line
  那样在他们离开队伍
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  and went to sit down
  坐下来吃饭的时候
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  there was a piece of fruit sitting on their tray.
  他们的盘子里就会多一份水果
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  I approached the committee with this idea,
  我向委员会提了这个意见
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  one of the principal's was willing to give it a try,
  有个校长愿意试一试
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  so we randomly assigned two elementary schools
  所以我们随机指定了两所小学
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  to the experimental and control condition.
  设置了实验条件和对照条件
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  In the control condition they just left it the way it was,
  对照条件中 我们就把蔬菜水果放在那
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  the kids could make a choice; and in the experimental condition,
  孩子们可以自己选择 在实验条件中