For example, nowhere in the world would people consider eating a rock, because a rock is non-food across all cultures; but aside from that, there's great variability and so social construction part of this is very important.

举例来说,世界上没有哪里的人会想吃石头,因为不管在哪种文化中,石头都不能当做食物,但是除此之外,各地的食物丰富而多样,所以社会意识是非常重要的一部分

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选