6. Cruciferous Vegetables
All cruciferous vegetables are rich in fiber and important vitamins and minerals making them very healthy for you. However, they are quite dangerous for people with iodine deficiency. The process of digestion for cruciferous vegetables blocks the thyroid’s ability to use iodine. You don’t need to completely stay away from them, but limiting your intake to just 5 ounces a day and cooking them reduces the effect on the thyroid.