diet

nouns

a prescribed selection of foods
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the food and drink that are regularly served or consumed
a legislative assembly in certain countries (e.g., Japan)
domain region
a constitutional monarchy occupying the Japanese Archipelago; a world leader in electronics and automobile manufacture and ship building
is a type of (narrower)
persons who make or amend or repeal laws
the usual food and drink consumed by an organism (person or animal)
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domain category
a living organism characterized by voluntary movement
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the food and drink that are regularly served or consumed
the act of restricting your food intake (or your intake of particular foods)
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verbs

follow a regimen or a diet, as for health reasons
"He has high blood pressure and must stick to a low-salt diet"
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abstain from certain foods, as for religious or medical reasons
"Catholics sometimes fast during Lent"
eat sparingly, for health reasons or to lose weight
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abstain from eating
"Before the medical exam, you must fast"