Estimation of dietary and discretionary salt iodine content
Food intake was assessed using a 24-h dietary recall. Participants were asked to recall all foods and beverages consumed the day before (time of urine collection) and to estimate the portion size with the help of a picture book. The conversion of food intake into iodine was performed using the Food Processor Plus software (ESHA Research, Inc., Salem, OR USA) adapted for the Portuguese population [The food were categorized into 15 major food groups [In the context of the iMC Salt study, the total sodium consumption was assessed through 24-h urinary excretion and a 24-h dietary recall [