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"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)"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."
Dr Edward Smith FRS (1819–1874) was a British physician and medical writer, born at Heanor, Derbyshire. According to his obituary, he failed to inspire the friendship of his colleagues, but more recent evaluations have noted that he "deserves to be better remembered by nutritionists, both for his contributions to the physiological basis of nutrition, and for his pioneering field surveys of dietary
"The same nutritive elements exist in both vegetable and animal foods, and … within certain limits, the two classes of food are interchangeable."
"Every … element, whether mineral or organic, which is required for nutrition is found in the vegetable kingdom."