In school-aged children, 1) Tg is a sensitive indicator of both low and excess iodine intake; 2) a median Tg of <13 μg/L and/or <3% of Tg values >40 μg/L indicates iodine sufficiency in the population; 3) the acceptable range of median UIC in monitoring iodized salt programs could be widened to a single category of sufficient iodine intake from 100 to 299 μg/L.

Although iodine intake was excessive and Tg concentrations were elevated, there was little impact on thyroid function. Chronic excess iodine intake thus appears to be well tolerated by women, infants, and children. However, such high iodine intake is unnecessary and should be avoided. Careful evaluation of contributions from both iodized salt and groundwater iodine is recommended before any review of iodization policy is considered.

Multiple micronutrient deficiencies are highly prevalent in Indonesia, but the interventions are still focused on single micronutrients. This study aimed to investigate the efficacy of multiple micronutrient supplements for improving micronutrient status, anemia, growth, and morbidity of Indonesian infants. In this double-blind, placebo-controlled trial, 284 infants aged 6-12 mo were randomly allocated to 4 treatment groups for 23 wk; 260 (92%) infants completed the study. Group 1 (DMM) received one adequate intake of multiple micronutrient supplements daily (n = 66); group 2 (WMM) received 2 adequate intakes of multiple micronutrient on 1d plus 6 d of placebo (n = 60); group 3 (DI) received 10 mg of iron supplement daily (n = 69); group 4 received a placebo supplement daily (n = 65). Blood samples were collected at baseline and at posttreatment to assess anemia and micronutrient status. Anthropometric measurements were taken monthly, and morbidity was recorded daily. At baseline, 58.1% of infants were anemic, 34.2% were iron deficient, 21.3% were vitamin A deficient, and 11% were zinc deficient. The DMM and DI supplements both corrected iron deficiency, but DMM supplements were more efficacious in improving hemoglobin levels of anemic infants than the other supplements. However, anemia still persisted in one-third of DMM infants posttreatment. The DMM supplement was more efficacious than WMM or DI supplementation in improving infant status of other micronutrients, including zinc, tocopherol, and riboflavin, whereas DI exacerbated zinc deficiency. There were no significant differences in growth and morbidity among treatment groups, and growth faltering was not prevented.

Diets of infants across the world are commonly deficient in multiple micronutrients during the period of growth faltering and dietary transition from milk to solid foods. A randomized placebo controlled trial was carried out in Indonesia, Peru, South Africa, and Vietnam, using a common protocol to investigate whether improving status for multiple micronutrients prevented growth faltering and anemia during infancy. The results of the pooled data analysis of the 4 countries for growth, anemia, and micronutrient status are reported. A total of 1134 infants were randomized to 4 treatment groups, with 283 receiving a daily placebo (P), 283 receiving a weekly multiple micronutrient supplement (WMM), 280 received a daily multiple micronutrient (DMM) supplement, and 288 received daily iron (DI) supplements. The DMM group had a significantly greater weight gain, growing at an average rate of 207 g/mo compared with 192 g/mo for the WMM group, and 186 g/mo for the DI and P groups. There were no differences in height gain. DMM was also the most effective treatment for controlling anemia and iron deficiency, besides improving zinc, retinol, tocopherol, and riboflavin status. DI supplementation alone increased zinc deficiency. The prevalence of multiple micronutrient deficiencies at baseline was high, with anemia affecting the majority, and was not fully controlled even after 6 mo of supplementation. These positive results indicate the need for larger effectiveness trials to examine how to deliver supplements at the program scale and to estimate cost benefits. Consideration should also be given to increasing the dosages of micronutrients being delivered in the foodlets. J. Nutr. 135: 631S-638S, 2005.