diet
noun
a prescribed selection of foods
a legislative assembly in certain countries (e.g., Japan)
the usual food and drink consumed by an organism (person or animal)
the act of restricting your food intake (or your intake of particular foods)
Synonymsdieting
verb
follow a regimen or a diet, as for health reasons
“He has high blood pressure and must stick to a low-salt diet”
eat sparingly, for health reasons or to lose weight
Source: WordNet 3.1, Princeton University