The potential side effects
Although these plants are healthy, in many respects, they contain certain ingredients that may well impede the function of the thyroid gland. If eaten in large quantities, these foods may even reduce the absorption of the thyroid hormone.
Lean meat, fish from cold seas, flax, and beans provide useful proteins and help maintain the health of the thyroid gland. Organic foods are a particularly good choice because they do not contain certain hormones and steroids that can reduce natural production of thyroid hormones.