Practice Quiz

Dietetic Technician DTR Exam Prep

Category - Dietetic Technician

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A goitrogenic food has which of the following effects?
  1. May increase urinary excretion of glucosinolates
  2. Suppresses thyroid activity and inhibits the synthesis of thyroxine
  3. Increases blood levels of uric acid
  4. 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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