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Registered Dietitian

Category - Nutrition Care

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A goitrogenic food has which of the following effects?

May increase urinary excretion of glucosinolates
Suppresses thyroid activity and inhibits the synthesis of thyroxine
Increases blood levels of uric acid
May interfere with calcium absorption

Explanation

Answer: B - A goitrogenic food suppresses thyroid activity by blocking iodine uptake, thereby inhibiting the synthesis of thyroxine. Goitrogenic foods include soy foods, (containing isoflavones), and vegetables in the Brassica family (broccoli, bok choy, Brussels sprouts), which contain isothiocyanates. Both isoflavones and isothiocyanates are believed to be goitrogens.

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Registered Dietitian

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