On the flip side, there are certain foods that people with underactive thyroids should minimize or avoid altogether, like cruciferous vegetables, particular raw Brassica vegetables like broccoli, cauliflower, cabbage, kale, soy, and Brussels sprouts. While these are healthy foods for most people, they contain a compound called goitrogens, which might impact thyroid function by impairing thyroid peroxidase. Gluten, conventional dairy, refined sugar and refined flour, caffeine and alcohol (which stress your adrenals) are also contraindicated for hypothyroid patients.
The majority of people who have an underactive thyroid such as Hashimoto’s disease, have an autoimmune disease whereby the immune system attacks thyroid tissue. So, in order to find an underactive thyroid natural treatment it is important to address the autoimmune issue. Just taking prescription medication for low thyroid function will simply just mask the symptoms.
“Infants fed soy formula are at higher risk for hypothyroidism and for later development of autoimmune thyroid diseases. In humans, goiter has been seen in infants fed soy formula; this is usually reversed by changing to cow milk or iodine-supplemented diets . After the 1960s, manufacturers reportedly began adding iodine to formulas to mitigate thyroid effects.” [Doerge]
Kale reigns supreme in the land of leafy green vegetables that we often eat raw, but beware if you have an iodine deficiency. “Kale gets a big baddy,” Blum says. “Eat it cooked.” When raw, this dark green leaf steals the iodine from the thyroid gland. If you must, it’s ok to nosh on the green veggie in your salad, but stop at two servings a day. No need to get extra credit on the superfood.
Although relatively low serum T3 levels could contribute to these residual manifestations, the higher serum T4:T3 ratio should also be considered. This has been well-established for 4 decades (28, 50, 59), but only recently has it been recognized as a relevant measure given that higher serum T4 levels will impair systemic T3 production via downregulation of a deiodinase pathway (9). Thus, some emphasis has recently been directed toward establishing the clinical significance of this ratio (1, 5).
Large predator fish—tuna, swordfish, shark, kingfish, mackerel—often have more mercury than smaller fish, as they’ve lived longer and had more time to accumulate harmful chemicals. Don’t eat more than two to three servings of these fish a week, Blum says. Also, farmed fish like salmon can have higher levels of mercury because they’re often fed the chum of other fish. All fish have a little mercury, so don’t freak out about it. Just don’t order in sushi every weeknight.
Megan Casper, RDN, a dietitian based in New York City and the founder of Nourished Bite, points out that iodine deficiency is the leading cause of hypothyroidism worldwide. This mineral can’t be made by the body, so dietary sources like iodized salt, dairy products, seafood, seaweed, and fortified cereals are important. “Iodine is an essential nutrient in the body, and thyroid hormones are composed of iodine,” explains Rizzo. “Those lacking thyroid hormones may also be lacking iodine.”
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