Substances which may cause goitre. These include chemicals such as cyanoglycosides and thiocyanates. They interfere with iodine utilisation by thyroid gland. They are found in food such as cabbage and cauliflower.

1. Physiology – MCQ 55 – Calcitonin secretion
2. Surgery – MCQ 12 – A 20 yr old girl with neck swelling and thyrotoxic symptoms
3. Food fortification
4. Food additives – types, regulations regarding their use