Sodium content of potable water: dietary significance

Americans are consuming more sodium than required for physiologic functions. While the dietary sources of sodium generally are recognized and understood, the contribution of drinking water as a source of sodium may be overlooked. Because water may account for up to 10% of an individual's daily sodium consumption, dietitians should know the sodium content of the public water supply. Patients on severe sodium-restricted diets may not be able to consume the public water available in their area because 42% of the nation's water supplies provide sodium in excess of the optimal level. While the use of bottled waters may be the client's first choice, it may not be an acceptable alternative. Dietitians need to know the types and sodium contents of bottled water available in their area. A glossary of water descriptors and a table that lists the sodium content of bottled waters by brand name are provided. Another table lists sodium content by soft-drink types. Dietitians are reminded to consider the effect of the increased fluid requirements of individuals exercising in hot or humid conditions.