在英语中，节食的意思就是"to eat less food, especially in order to lose weight or to improve one's health"，可以翻译为"dieting"。节食的词源来自于中世纪拉丁语的"diaeta"，意思是"日常饮食"或"生活方式"。例句：

I'm trying to lose weight, so I'm dieting.

我想减肥，所以我在节食。

Have you considered dieting to lower your cholesterol levels?

你考虑过节食来降低胆固醇吗？

最后，还要注意，在英语中，"dieting"还可以指"定量饮食"，即"to eat a special kind of food or to follow a special kind of diet, for example because of a medical condition"。例如：

I have to go on a strict diet because of my diabetes.

我必须严格节食，因为我有糖尿病。

My doctor recommended a low-salt diet to help with my high blood pressure.

我的医生建议我低盐饮食，以帮助我的高血压。