By the way, doctor: Do soy products cause thyroid problems?
In 2003, a randomized clinical trial compared a daily dose of 90 mg of isoflavones with a placebo in 38 healthy postmenopausal women with normal iodine intake. After six months, there were no differences in thyroid function between the treatment and placebo groups. So soy shouldn't cause thyroid problems as long as you get enough iodine in your diet.
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