Definition for English-Language Learners from Merriam-Webster’s Learner’s Dictionary

plural diets

plural diets

Learner’s definition of DIET

1 : the food that a person or animal usually eats

[count]

  • Diets that are rich in fruits and vegetables have been shown to help prevent disease.

  • a balanced diet

often + of

  • Many birds live on a diet of insects.

[noncount]

  • studying the association between diet and disease

2 : the kind and amount of food that a person eats for a certain reason (such as to improve health or to lose weight)

[noncount]

  • She lost a lot of weight through diet and exercise.

[count]

  • a low-fat diet

  • a liquid diet

  • He’s on a diet. [=he is eating less food or only particular kinds of food in order to lose weight]

  • He went on a diet and lost 30 pounds in six months.

3 [singular] : something that is provided or experienced repeatedly

+ of

  • We’ve been given a steady diet of political scandals in recent months.

2 diet /ˈdajət/ verb

diets; dieted; dieting

diets; dieted; dieting

Learner’s definition of DIET

[no object]

: to eat less food or to eat only particular kinds of food in order to lose weight : to be on a diet

  • I’ve been dieting for two months.

3 diet /ˈdajət/ adjective

Learner’s definition of DIET

always used before a noun

1 : having a smaller number of calories than usual 2 : intended to help people lose weight

Source

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