Water as a Sodium Source and Its Relation to Sodium Restriction Therapy Patient Response

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Abstract
Attention is directed to the Na content of hidden sources of Na which, may nullify attempts to reduce dietary intake of that element. Evidence is presented suggesting need for routine determination of Na in water for domestic use in the establishment of a restricted Na regimen, sodium content may be especially high in untreated ground-water or water that has been softened by the zeolite cation-exchange or excess soda-ash processes. If Na restriction is severe, many surface supplies may contain excessive Na. Of paramount importance is recognition of the problem by the clinician, dietitian, and public health nurse, with the aid of the sanitary engineer and laboratory analyst, in order that the efficacy of otherwise carefully planned diets and conscientious patient application may not be contravened. Recognition also is significant from the standpoint of certain complications (e.g., "Na depletion" syndrome) occasionally accompanying Na restriction therapy.

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