我下周开始节食，希望能在圣诞节前减掉两公斤。

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

医生让我进行低盐饮食以降低血压。

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

我正在认真节食，而且必须每天锻炼。

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