"dieting" in the noun sense
1. diet, dieting
the act of restricting your food intake (or your intake of particular foods)
"dieting" in the verb sense
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® (An amazing lexical database of English)
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