Cabbage, broccoli, cauliflower and the rest of the cabbage family are known to be cancer fighters. However, for those with thyroid issues such as hypothyroidism it can mean trouble. A chemical known as goitrogen can suppress thyroid hormone production. Peanuts, milk and dairy products, soy products, refined sugar can also damage the thyroid. Besides the goitrogen which is also found in peanuts and soy, the protein casein in dairy products interferes with the production of the thyroid hormone, thyroxine. Pasteurizing has made the effect of casein worse, creating an undigestible food for humans. Refined sugar is not good for anyone, but it's especially hard on the sluggish thyroid.
The thyroid and adrenal glands can become exhausted dealing with excess sugar in the body. Iodine is good for the thyroid, isn't it? Studies with kelp and other sea vegetables have proven they are beneficial to the thyroid. The key is moderation. Excess iodine can be as damaging as too little. The opinion is that most people get enough iodine in table salt and from fertilizers used in agriculture. Sea vegetables are not only salty so the need for table salt is greatly reduced, but they are teeming with minerals and vitamins.
Focusing on nutrition that will aid the thyroid is the best advice. Whether its hypo-or-hyperthyroidism you're dealing with, the following foods and nutrients will help you the most. Coconut oil, kelp (as mentioned before), radishes and watercress will balance the thyroid. Besides iodine, make sure copper, selenium, vitamin C and zinc are in adequate amounts in your diet, supplementing where needed. As always, it's important to work along with a physician if you think you have thyroid problems. It sometimes takes a few tests to really determine what the issue is. Go to this site for a complete review of all the tests available.
Other informational sites are listed below.