Cooking partially inactivates the interfering chemical, known medically as a goitrogen.
From the en.wikipedia.org
Cabbage may also act as a goitrogen.
From the en.wikipedia.org
Pathogenesis of goiter in the bongo may reflect a mixture of genetic predisposition coupled with environmental factors, including a period of exposure to a goitrogen.
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Any substance (such as thiouracil) that induces the formation of a goiter
Goitrogens are substances that suppress the function of the thyroid gland by interfering with iodine uptake, which can, as a result, cause an enlargement of the thyroid, i.e., a goitre.
Any agent that causes goiter, such as thiouracil
(Goitrogens) Substances found primarily in plants that impair the ability of the body to use iodine to synthesize thyroid hormone. When TH synthesis is affected by goitrogens, the body may grow a goiter in an effort to make enough thyroid hormone.