Goitrogen

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.

Certain foods have been identified as goitrogenic. These foods include: soybeans (and soybean products such as tofu), peanuts, strawberries, pears, peaches, spinach, bamboo shoots, broccoli, brussels sprouts, cabbage, cauliflower, mustard greens.

Some foods and drinks have an opposite effect on the thyroid gland--that is, they stimulate thyroid function rather than suppressing it; examples being avocado, coconut, and saturated fat.