Edward Smith citations

“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.”

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Edward Smith (physician)

Introd., p. 1
Foods

“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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Edward Smith (physician)

Source: Foods, Ch. XIX, p. 143

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

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Edward Smith (physician)

Source: Foods, Ch. XIX, p. 143