'As a member of the Brassica (Cabbage) family, Brussels Sprouts contain goitrogens. If plants that are high in goitrogens are consumed in large amounts, it can interfere with the body's ability to absorb and utilise iodine, and this can result in damage to the thyroid. However, because Brussels Sprouts are also a good source of iodine, this will to some extent counteract the detrimental effect of the goitrogens, and it is therefore a plant that can be fed in moderation during the winter season when other foods are not as readily available.
Please be aware that two or more
goitrogenic plants should not be fed in conjunction with each other, and
the sum total of goitrogenic foods should not exceed the guideline for a
single plant of 'in moderation' (amber-green) or 'sparingly'
(amber-red). This will ensure that goitrogenic consumption stays within