Salt intake is the name of an additional assessments which includes additional urine analyses and an additional questionnaire. This additional assessment was implemented in Lifelines at the initiative of the National Institute for Public Health and the Environment (RIVM) . The aim of this project was to determine whether the average intake of sodium, potassium, and iodine of Lifelines participants in 2020 has changed compared to 2006-2007 as the result of initiatives and policy changes. Note that the additional urine analyses are linked to the urine samples collected during the third assessment.