The calorie density has changed because food is processed, so the calories in the fat and the sugar that can get squeezed into things made possible by technological changes has shifted things a lot.

食品经过加工,热量密度发生了变化,添加到食品中的脂肪和糖类,其卡路里含量可通过技术手段进行调整,进而造成很大不同

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

We give you six questions. And we will ask you on the day of the final to respond to three of those--our choice, it would be hardly sporting if you got to pick the three.

给你六个问题,等考试那天,让你回答三个问题,我们挑,要是让你们挑就真没什么技术含量了

耶鲁公开课 - 1871年后的法国课程节选