A study by ICCIDD regional coordinator Vincent Assey and associates, published in BMC Public Health, finds "marked improvement in iodine nutrition in Tanzania, twelve years after the initiation of salt iodation programme."

The study identifies two problems in sustaining IDD elimination in Tanzania: to better reach the areas with low coverage of iodized salt, and to reduce iodine intake in areas where it is excessive. Particular attention is needed in improving salt producers' quality control.