diet的基本意思是“进特种饮食”或“节食”,多用于在医生劝导或规定之下。可用作不及物动词,也可用作及物动词,用作及物动词时,可接名词、人称代词或反身代词作宾语。

用作不及物动词
▲S+～(+A)
He is dieting.他在节食。
He got so fat that he had to diet.他太胖,需要节食。
用作及物动词
▲S+～+n./pron.
His doctor is dieting him strictly.他的医生严格规定他的饮食。
I am dieting myself on vegetation.我在吃素。
She became so fat that she had to diet herself.她长得太胖,所以不得不实行节食。

［词源］＜中古英语diete(饮食)

go on a diet
用规定食谱,节食 allowed to eat only some foods or a little food, because of illness or to lose weight
No sugar for me, please.I went on a diet.请别给我加糖,我现在正按照规定节食。

My diet is made up of rice and vegetables.我日常的饮食包括米饭和蔬菜。
The doctor put me on a low-salt diet.医生嘱我饮食要少盐。
Noise pollution is a daily diet in big cities.在大城市,噪音污染是家常便饭。

diet, food, provisions, rations, table
参见food条。
diet, meal, repast
参见meal条。