9 Foods to Avoid with an Underactive Thyroid (Hypothyroidism)

Examples: broccoli, cauliflower, cabbage, Brussels sprouts, kale.

Raw cruciferous veggies contain goitrogens that may inhibit iodine uptake by the thyroid. Cooking reduces this effect.

3. Gluten
Found in wheat, barley, rye, and many processed foods.

Gluten can worsen autoimmune thyroid conditions like Hashimoto’s thyroiditis.

4. Processed Foods & Sugars
Packaged snacks, sweets, and sugary drinks.

These contribute to inflammation and may worsen thyroid function.

5. Fatty Foods
Fried foods, high-fat dairy, and fatty cuts of meat.

High fat intake can impair the body’s ability to absorb thyroid hormone replacement.

6. Certain Fruits (In Excess)