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 struct… - Edward Smith

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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.