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As a general definition, it may be stated that a food is a substance which, when introduced into the body, supplies material which renews some structure or maintains some vital process; and it is distinguished from a medicine in that the latter modifies some vital action, but does not supply the material which sustains such action.

— Edward Smith

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Every … element, whether mineral or organic, which is required for nutrition is found in the vegetable kingdom.

The same nutritive elements exist in both vegetable and animal foods, and … within certain limits, the two classes of food are interchangeable.

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Quote text and notes from Wikiquote: Edward Smith (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.