According to a report from American Academy of Pediatrics published May 24, 2014 said that, a lot of women in the United States are with iodine deficiency when they’re in reproductive age. It may because the salt in their daily dietary is not iodized.
Iodine is one of the essential nutrient for thyroid hormones. Any iodine deficiency will cause a hypothyroidism, with the symptom of over weighted, energy deficiency or goiter. You may eat some foods with iodine rich, like seafood, seaweed and kelp. Also some table salt is iodized, you can choose it from market.
On the other hand, too much iodine intake in your dietary will also cause hypothyroidism. A research initialed in Journal of Pediatrics, announced that excess intake of 12.5 mg iodine when the mothers were pregnant or breastfeeding, caused three infants were developed thyroid hormone deficiency. The researcher agreed that it was important for taking supplement contains iodine, but they also stressed that it will cause a negative effect of exceeding the safe threshold of iodine. There are 10 times iodine levels in the infants’ blood than the healthy babies. The study stated that most of the congenital hypothyroidism occurred in infant is resulting from an iodine deficiency instead of an over intake of iodine supplement. In the developed country, the iodized salt plays an important and helpful role to reduce the iodine deficiency commonly, nevertheless, the salt in processed foods is not iodized in a general speaking.
So what’s the RDAs (Recommended Dietary Allowances) and ULs(Upper Tolerable intake levels) for iodine? From the recommendation of the American Academy of Pediatrics, the expectant women requires a dosage of 150 mcg iodine nutrient from 197 mcg potassium iodine.
Here is the RDAs dosage for different ages:
Age 1 – 8: 90 mcg
Age 9 – 13: 120 mcg
Age 14 and older: 150 mcg
Pregnant women: 220 mcg
Lactating women: 290 mcg
ULs for different ages:
Age 1 – 3: 220 mcg
Age 4 – 8: 300 mcg
Age 9 – 13: 600 mcg
Age 14 – 18: 900 mcg
Age 19 and above: 1,100 mcg
In the United States, most of the prenatal and lactating women are taking nutrient supplement, but only 15% – 20% of the supplement contains the essential of iodine! Many of prenatal vitamins don’t have any iodine. Even it contains, the dosage is less than 150 mcg. You can learn to how to choose the best prenatal vitamins from here.