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According to Tuyen, mandatory iodine fortification was implemented in Vietnam before 2005 and when it was dropped, the coverage rate dropped sharply to 40% nationwide just four years later. Only 6% of asked people said they used iodized salt while the majority seasoned their food with fish sauce and other seasonings.
The Iodine Global Network still ranks Vietnam on the list of 19 countries with iodine deficiency.
"The Iodine Global Network advised to use iodine salt directly for food seasoning, food processing and animal feed," Tuyen said.
A governmental decree on food fortification took effect in March last year but it was ignored by most firms.
According to UNICEF, iodine deficiency will cause miscarriage, goitre and brain damage in the fetus and infant. The recommended dietary allowance of iodine is 90-120 mcg/day for children aged 1 to 11 years old and 150 mcg/day for adults and adolescents.