我下周要开始节食，希望圣诞节前减掉五磅。

I'm going on a ___diet next week and hope to lose five pounds before Christmas.

医生让我采用低盐饮食来降低血压。

The doctor put me on a low-salt ___diet to reduce my blood pressure.

我正在严格节食，而且必须锻炼。

I'm on a serious ___diet, and I have to exercise.