Background: A 4-year-old female patient was diagnosed with hypothyroidism caused by iodine deficiency. The patient's iodine levels in serum and urine were significantly low. The iodine concentration in the enteral formula was 1.6 µg/100 kcal as measured by inductively coupled plasma mass spectrometry. The patient's iodine intake while receiving the enteral formula was calculated to be 16 µg/day, which is much lower than the recommended dietary reference intake of 80 µg for children aged 3-5 years. The purpose of this study was to assess iodine concentrations in 20 enteral nutritional formulas available in Japan in order to assess whether low iodine concentration is a characteristic of one specific formula or whether it is a more prevalent problem.
Methods: Iodine concentrations in 20 popular nutritional formulas available in Japan, for which iodine content is not indicated in the ingredient list, were analyzed with inductively coupled plasma mass spectrometry.
Results: Iodine concentrations were less than 5 µg/100 kcal and less than 10 µg/100 kcal in 13 and 18 enteral nutritional formulas, respectively.
Conclusions: Most of the enteral nutritional formulas analyzed had low iodine concentrations. These findings suggest that iodine deficiency is a likely outcome in patients who receive these formulas for a prolonged period.
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