The first assumption did not consider bottled water consumption. Investigating the iodine deficiency among Israeli children, Barnett-Izhaki et al. ( ) did not find statistically significant differences in median UIC in children consuming non-filtered tap, filtered, or bottled drinking water . In our previous study, we demonstrated that the iodine content in bottled waters available in Israel was 7.68±2.41 (average ± standard error) with a median value of 6.89 µg I L-1 (calculated from the data published in ). We may, therefore, assume that bottled water is equivalent to the tap water from groups C and D in terms of its iodine concentration and, when consumed together or even instead of tap water as drinking water, cannot significantly change the overall personal iodine intake.