Various approaches to measuring the daily salt intake in individuals have been tried. Salt comes from: (1) natural products; (2) salt added during industrial processing; (3) salt from catering; (4) other sodium-containing sources; (5) discretionary use of salt in cooking and table salt; and (6) sodium in drinking water. Traditional methods of estimating salt intake, e.g., with economic data, lead to marked errors and usually substantial overestimates. These have now been replaced by more modern methods.
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