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Could that superstar among superfoods, actually not be quite so awesome? Kale is a mild goitrogen — in rare cases it prevents the thyroid from getting enough iodine. But kale shouldn’t be a problem for you unless you get very little iodine in your diet and you’re eating large amounts of kale. This is also the case (in varying degrees) for cabbage, broccoli, cauliflower, and Brussels sprouts.
In rare cases, some of the chemicals found in soy products like soy milk or edamame could hurt your thyroid’s ability to make hormones, but only if you don’t get enough iodine and eat large amounts. Just like with kale, if your iodine levels are OK, you probably don’t need to worry about soy.