Satisfactory nutrition of a person or of a group of people depends ultimately on the money available for the purchase of food. Intimately involved in the solution of this essentially financial problem is the discovery of the factors that determine maximum economy in the physiologic utilization of essential nutrients. Generally acceptable standards must be established by which both human nutritional status and diets can be appraised. Now a standard for estimating the nutritional status of persons with respect to the need and the utilization of the vitamins by the body has been considered thoroughly and critically in a recent review by Dann and Darby,1 who have suggested that five "zones" of nutrition be recognized: (1) nutritional saturation, (2) nutritional unsaturation without functional impairment, (3) potential nutritional deficiency, (4) latent nutritional deficiency disease and (5) clinically manifest nutritional deficiency disease. Nutritional saturation is intended to mean that the body is
PHYSIOLOGIC AND FINANCIAL ECONOMY IN NUTRITION. JAMA. 1945;129(8):553–554. doi:10.1001/jama.1945.02860420021012
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