JAMA. 1934;102(14):1157. doi:10.1001/jama.1934.02750140043019.
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The rapidly growing knowledge of the manifold types of nutritional defects and their relation to human well being is beginning to influence almost every field of medical practice. Indeed, at present the investigation of the indispensable exogenous facts, such as the vitamins and certain inorganic compounds, and researches on the endogenous hormones, seem to vie with one another for consideration in the domain of practical therapy. Foods have become in the eyes of practitioners something more than mere carriers of energy. Glandular secretions and extracts, derived from tissues and organs distributed along the way from the pituitary to the gonads, are finding applications and experimental trial in a dozen unusual ways. As a medical writer remarked nearly a century ago, we have to cultivate a science and exercise an art.1

Much is being written about "growth promoters," an expression used most commonly to include some of the vitamins; but


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