I think it also depends on where you are in the disease. If you are on thyroid hormone replacement, then the foods Jan mentioned would hold true. If you still have your thyroid – i.e. on anti-thyroid drugs – then I don’t think you need to watch out for certain foods, in general. There may be certain situations where your doctor might want you to avoid certain things. I am on ATDs and my doctor has never mentioned special diets either – except maybe to lose some weight!