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Relationship between diabetes mellitus mortality rates and drinking water magnesium levels in Iowa.

A recent ecologic study has suggested a relationship between mortality from diabetes mellitus and levels of magnesium in drinking water. However, diabetes mortality rates were from aggregate data for the entire geographic area under study. The state of Iowa has data resources available to determine diabetes mortality rates for individuals on known water supplies in Iowa and magnesium levels for raw drinking water supplies. To determine the presence of this relationship in the state of Iowa, mortality rates from 1976 through 1985 for diabetes as an underlying cause of death and for major cardiovascular disease with diabetes as an ancillary cause of death were compared for individuals from towns in Iowa with populations of 1,000 to 10,000. At the stratification levels of magnesium in municipal drinking water used in this study, no significant differences were found in diabetes mortality rates.