Noun
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the act of restricting your food intake (or your intake of particular foods)
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the usual food and drink consumed by an organism (person or animal)
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a legislative assembly in certain countries (e.g., Japan)
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a prescribed selection of foods
Verb
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eat sparingly, for health reasons or to lose weight
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follow a regimen or a diet, as for health reasons
"He has high blood pressure and must stick to a low-salt diet"