There are no specific foods that improve low thyroid function, or hypothyroidism, but eating a wide range of fruits and vegetables high in antioxidants, such as berries and grapes, is recommended, according to WebMD. No specific supplements are effective in treating hypothyroidism. Some may interfere with treatment and be harmful.
Limiting foods with saturated fat, such as red and organ meats, is recommended, explains WebMD. Eating seafood high in healthy omega-3 fatty acids, such as fish and shrimp, at least twice a week is also helpful. Spinach, lettuce and other leafy greens are high in magnesium and can relieve fatigue and muscle cramps and regulate heart rate. Brazil nuts are rich in magnesium and selenium, two minerals that support the thyroid.
Kale prevents the thyroid from getting enough iodine, states WebMD. Hypothyroid individuals with insufficient iodine in their diets may experience problems eating kale, cabbage, broccoli, cauliflower and Brussels sprouts. Soy may reduce the ability to absorb thyroid hormone medication. Patients are counseled to avoid eating soy products close to the time they take medications.
Iodine supplements can cause the thyroid to make too much or too little hormone and are not recommended, explains WebMD. Herbs have not been proven safe or effective and may also interfere with medication.