Dairy milk supplies between a quarter and a half of the daily iodine requirement in the United States.

So milk itself has little native iodine.

The milk iodine content is mainly determined by factors like the application of iodine

containing teat disinfectants.

The iodine residues in milk appear to originate mainly from the contamination of the teat's surface.

The teats are sprayed or dipped with like a betadine-type disinfectants, and the iodine

just kind of leeches into the milk.

Too bad most of the plant-based milks on the market aren't enriched with iodine, too.

Fortified soy milk is probably the healthiest of the plant milks, but even if it was enriched

with iodine, what about the effects of soy on thyroid

functions?

It's funny when I searched the medical literature on soy and thyroid.

This study popped up a cost-effective way to train residents to do thyroid biopsies,

just stick the ultrasound probe right on top and go to town.

Turns out on ultrasound, your thyroid gland looks a lot like tofu.

Anyways, the idea that soy may influence thyroid function originated over eight decades ago

when marked thyroid enlargement was seen in rats fed raw soybeans.

Though the observation that people living in Asian countries have consumed soy foods

for centuries with no perceptible thyrotoxic effects that certainly suggests

their safety, bottom line, there's not seem to be a problem with people who have normal

thyroid function.

However, soy foods may inhibit the oral absorption of synthroid, thyroid-throid hormone

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