Climat Impact on Urinary Iodine Concentration

* Female * Non-pregnant and non-lactating * General good health, assessed by no reported treatment for chronic disease * Non-smoking * No known history of major medical illnesses or thyroid dysfunction as well as gastrointestinal or metabolic disorders and taking no chronic medication * Residence at the respective study site for 12 months or longer and no plans of moving away during the study year. * No use of iodine containing dietary supplements during the last 6 months * No use of X-ray / CT contrast agent or iodine containing medication within the last year * No use of iodine containing disinfectants during the last 6 months * Participants should be between 18 and 49 years at date of enrollment