The quality or state of being healthful; the degree to which something promotes good health and well-being.
Derived from 'healthful' plus the noun-forming suffix '-ness.' This abstract noun allows people to discuss health-promotion as a concept rather than just applying the adjective to specific items.
Creating nouns from adjectives with '-ness' is one of English's most productive word-building tools—'healthfulness' lets us debate the abstract idea of what makes things healthy rather than just labeling them 'good for you.'
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