"diets" in the noun sense
1. diet
a prescribed selection of foods
2. diet
a legislative assembly in certain countries (e.g., Japan)
3. diet
the usual food and drink consumed by an organism (person or animal)
4. diet, dieting
the act of restricting your food intake (or your intake of particular foods)
"diets" in the verb sense
1. diet
follow a regimen or a diet, as for health reasons
"He has high blood pressure and must stick to a low-salt diet"
2. diet
eat sparingly, for health reasons or to lose weight
Source: WordNet® (An amazing lexical database of English)
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