They've eaten their lunch for themselves.

他们就是在吃自己的午餐。

耶鲁公开课 - 死亡课程节选

Now you can begin to see the kinds of errors that this method might produce because people forget, they can't remember exactly how much they ate of things, or they may not be willing to disclose everything they ate.

现在你就可以明白各种误差,是由人们的遗忘而产生的,他们无法准确记得吃了多少东西,他们不会透露所有自己吃的东西

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

If you go to the dining hall you know, the portions-- one person serves themselves this much of a food and another serves themselves another, and then when you go to a restaurant there are variations on how much you get served of things, and so it's very hard to estimate portions for people.

如果你去食堂,摄入量是指,一个人吃了自己的那部分食物,或其他人吃的他们的那一部分,当你去餐厅,每次吃多少是变化的,因此估算每个人的摄入量是很难的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

He's making his own decision as you said and no woman is going to tell him to eat quiche or tofu and that you may have missed it but in the song there we'll show this later in class again but in the song they say that 'I won't eat quiche anymore' and 'goodbye to tofu' and things like that.

正如你所说,他是在做出自己的决定,没有女人会要求他们吃什锦蛋饼或是豆腐,你们可能没注意到但是背景音乐中有提及,等下我会再放一次,但背景乐中有'我再也不吃什锦蛋饼了',永别豆腐,之类的歌词

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选