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Meaning of “diet” in the English Dictionary

"diet" in British English

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dietnoun

uk   /ˈdaɪ.ət/  us   /ˈdaɪ.ət/
B1 [C or U] the food and drink usually eaten or drunk by a person or group: Diet varies between different countries in the world. a healthy/balanced/varied diet Rice is the staple diet (= most important food) of many people in China. The children seem to exist on a diet of fried food.
B1 [C] an eating plan in which someone eats less food, or only particular types of food, because they want to become thinner or for medical reasons: I'm going on a diet next week and hope to lose ten pounds before Christmas. a crash/strict/calorie-controlled diet The doctor put me on a low-salt diet to reduce my blood pressure.
[S] a particular type of thing that you experience or do regularly, or a limited range of activities: He was brought up on a diet of political propaganda from birth. Network TV only offers a diet of bad reality shows every night.

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dietadjective [before noun]

uk   /ˈdaɪ.ət/  us   /ˈdaɪ.ət/

dietverb [I]

uk   /ˈdaɪ.ət/  us   /ˈdaɪ.ət/
to limit the food and/or drink that you have, especially in order to lose weight: You should be able to reduce your weight by careful dieting.
(Definition of diet from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"diet" in American English

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dietnoun [C/U]

 us   /ˈdɑɪ·ɪt/
the food and drink usually taken by a person or group: [C] A healthy diet includes fresh vegetables. [C] fig. Gifted students given a steady diet of grade-level curriculum learn they don’t need to work hard.
A diet is also the particular food and drink you are limited to when you cannot eat or drink whatever you want to: [C] a low-salt diet [C] I’m going on a diet because I’ve got to lose some weight.
dietary
adjective  us   /ˈdɑɪ·ɪˌter·i/
Health experts say dietary changes have to start with children, who can be taught to appreciate a healthy diet.

dietverb [I]

 us   /ˈdɑɪ·ɪt/
to limit the food that you take, esp. in order to lose weight: He began dieting a month ago and says he has lost ten pounds already.
dieter
noun [C]  us   /ˈdɑɪ·ɪ·t̬ər/
Studies show there may be as many as 30 million American dieters at any one moment.

dietadjective [not gradable]

 us   /ˈdɑɪ·ɪt/
(of food or drink) containing much less sugar than usual and often sweetened artificially, or containing less fat than usual: diet soda
(Definition of diet from the Cambridge Academic Content Dictionary © Cambridge University Press)
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“diet” in British English

“diet” in American English

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