While nutritional deficiencies may not be the cause of hypothyroidism, not having enough of these micronutrients and minerals can aggravate symptoms: vitamin D, iron, omega-3 fatty acids, selenium, zinc, copper, vitamin A, the B vitamins, and iodine.
A few highlights:
It’s commonly believed that hypothyroidism is due to insufficient iodine, but this isn’t true. Dr. Kharrazian states that if you have Hashimoto’s, taking supplemental iodine is like throwing gasoline on a fire, so eschew iodine supplements and iodized salt. Primary sources of iodine: sea vegetables and seafood. Secondary sources: eggs, asparagus, lima beans, mushrooms, spinach, sesame seeds, summer squash, Swiss chard, and garlic. Optimal vitamin D levels are between 50-80 ng/mL; anything below 32 contributes to hormone pathway disruption. Omega-3s, found in fish, grassfed animal products, flaxseeds, and walnuts, are the building blocks for hormones that control immune function and cell growth, are critical to thyroid function, and improve the ability to respond to thyroid hormones
Be mindful of goitrogens
goitrogens are foods that can interfere with thyroid function. Goitrogens include broccoli, Brussels sprouts, cabbage, cauliflower, kale, kohlrabi, rutabaga, turnips, millet, spinach, strawberries, peaches, watercress, peanuts, radishes, and soybeans. Does it mean that you can never eat these foods? No, because cooking inactivates goitrogenic compounds and eating radishes and watercress in moderation isn’t going to be a deal-breaker.
Go 100% gluten-free.
The molecular composition of thyroid tissue is almost identical to that of gluten. So for those with Hashimoto’s, it’s a case of mistaken identity. Eating gluten can increase the autoimmune attack on your thyroid.