Posted by Chantel M. research contributed US National Library of Medicine
National Institutes of Health
Twenty-five healthy postmenopausal women (mean age 58 years) completed a
double-blinded randomized crossover study. Ten capsules (5 g/day) of
placebo or seaweed (Alaria esculenta), providing 475 microg of
iodine/day, were consumed daily for 7 weeks. A powdered soy
protein isolate (Solae Co., St. Louis, MO), providing 2 mg of
isoflavones/kg of body weight, was given daily during the last week of
each treatment arm. On average, this provided 141.3 mg of
isoflavones/day and 67.5 g of protein/day, posted in PubMed, indicated that Soy
supplementation did not affect thyroid end points. Seven weeks of 5
g/day seaweed supplementation was associated with a small but
statistically significant increase in TSH. Soy protein isolate supplementation was not associated with changes in serum thyroid hormone concentrations.
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