Soy's effect on thyroid was first noticed when hypothyroid babies were given soy formula, ad they became more severely hypothyroid. They were unable to overcome the anti-thyroid effects of soy, so I guess here is simple answer to your question. A report to this effect appeared in the New
England Journal of Medicine in 1960, and since then many other small studies have confirmed that soy is a goitrogen. This means soy products contain a substance that can cause enlarged thyroid known as a goiter. Endocrinologists, thyroid specialists, are frequently unaware of the potential anti-thyroid effects of soy on hypothyroid women who are in menopause and are often eating a lot of soy. Recent research leaves little doubt that dietary isoflavones in soy have a profound effect on thyroid function. A study by
Japanese researchers concluded that intake of soy by healthy adults for a long duration caused enlargement of the thyroid. Beside this effect, consummation of soy product leads to the suppressing thyroid function. These researchers studied the effects of feeding 30 g of soybeans per day on thyroid function and found that after one month there was a significant increase in thyroid stimulating hormone.
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