Managing hypothyroidism can be challenging, as it requires a careful balance between hormone therapy and dietary choices. Although there isn’t a specific “hypothyroidism diet,” certain foods may affect thyroid function or the effectiveness of medications. Below are nine foods to limit or avoid if you have hypothyroidism, based on advice from nutritionists and medical professionals.

1. Soy-Based Foods

Soy contains isoflavones, which can interfere with iodine absorption, a vital nutrient for thyroid health. Research indicates that soy products like tofu, edamame, and soy milk may hinder thyroid hormone absorption, especially when consumed near medication times. To minimize risks, wait at least four hours after eating soy-based foods before taking thyroid medication.

Consider substituting soy with other plant-based proteins, such as lentils or chickpeas, which are less likely to impact thyroid function.

2. Cruciferous Vegetables

Raw cruciferous vegetables—such as broccoli, cauliflower, and Brussels sprouts—contain goitrogens, compounds that can interfere with iodine utilization. While these vegetables are nutritious, eating them raw in large quantities might suppress thyroid function.

Cooking these vegetables neutralizes most goitrogens, making them safer to consume in moderation.

3. Gluten

Individuals with hypothyroidism, particularly those with Hashimoto’s thyroiditis, often have celiac disease or gluten sensitivity. Gluten can trigger inflammation, potentially worsening thyroid issues and reducing medication efficacy.

If you suspect gluten sensitivity, consider testing for celiac disease and switching to gluten-free grains like quinoa or rice if necessary.

4. Processed Foods

Processed foods typically contain high sodium levels, which may heighten hypothyroid risks like high blood pressure. These foods are also low in essential nutrients and can increase inflammation. Avoid packaged snacks, frozen meals, and fast food.

Instead, focus on whole, minimally processed foods such as fresh fruits and vegetables.

5. Sugary Treats

Since hypothyroidism slows metabolism, weight gain can occur more easily. Sugary foods like pastries, candy, and soda add empty calories, which may contribute to weight gain and energy level fluctuations.

To satisfy sweet cravings, opt for natural alternatives like honey or enjoy fruits such as berries.