The macro nutrients are the big constituents of food, that's protein, carbohydrate, and fat.

大量营养素是食物重要组成来源,即蛋白质,碳水化合物和脂肪

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 take in a lot of food and water everyday, every year, and yet most of us our weight stays remarkably stable over that period of time for adults despite how much we eat and how much we drink.

日复一日年复一年,我们都摄入大量的食物和水,但我们绝大部分人的体重,在成年期都保持得很稳定,不管我们怎样大吃大喝

耶鲁公开课 - 生物医学工程探索课程节选