###Human: I am under Levothyroxine for underactive thyroid. What kind of foods should I avoid? ###Assistant: Hello. Avoid raw cabbage, cauliflower, brocolli, soy and soy products like soy sauce, soy milk, tofu, strawberry, walnut, spinach, and brussel sprouts. Do not take any meals or drink except plain water for atleast 45 minutes after taking medication. Avoid taking acidity-causing foods, calcium and iron supplements with the medicine.