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Quiet Heather wrote:I was told that my TSH level was borderline and was wondering if I should eat less soy because of this. !
Quiet Heather wrote: Can soy cause thyroid problems? Thanks!
Dr McDougall wrote:
Argument 5: Thyroid
Detrimental: Goiter and hypothyroidism have been reported in infants receiving soy formula. Autoimmune diseases of the thyroid and thyroid cancer may also be caused by exposure to soy.11-12
Beneficial: The addition of adequate iodine to the diet reverses any goiter-causing effects of soy. Population studies suggest soy protects against thyroid cancer.13
11) Divi R. Anti-thyroid isoflavones from soybean: isolation, characterization, and mechanisms of action. Biochem Pharmacol. 1997 Nov 15;54(10):1087-96.
12) Doerge DR, Sheehan DM. Goitrogenic and estrogenic activity of soy isoflavones. Environ Health Perspect. 2002 Jun;110 Suppl 3:349-53.
13) Horn-Ross PL, Hoggatt KJ, Lee MM. Phytoestrogens and thyroid cancer risk: the San Francisco Bay Area thyroid cancer study. Cancer Epidemiol Biomarkers Prev. 2002 Jan;11(1):43-9.
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