It cannot be changed. The expression comes from the idea that water that has fallen over a dam cannot be brought back again.

VOA: special.2009.05.10

The distance to food has changed a lot because food has to come in from far greater distances than used to be the case, and that's changed our relationship with food a lot, into a distant rather than a close relationship.

现在人和食物之间的距离发生了很大改变,现在的食物来自比以前远得多的地方,这在很大程度上,我们和食物间的关系,被渐渐地拉远了

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

The distance to food has changed a lot because food has to come in from far greater distances than used to be the case, and that's changed our relationship with food a lot, into a distant rather than a close relationship.

现在人和食物之间的距离发生了很大改变,现在的食物来自比以前远得多的地方,这在很大程度上,我们和食物间的关系,被渐渐地拉远了

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选