... oil for the vegetable oil, Vidalia or green onion for the yellow onion, and balsamic vinegar for the lemon juice. 7th Edition, 2010 • ThyCa: Thyroid Cancer Survivors’ Association, ... servings per day of grains, cereals, pasta, and breads without iodine-containing ingredients are fine on this diet. The iodine content depends on the iodine content of the region where the grain ... more. The diet usually begins around two weeks before testing and continues through the testing and treatment period. However, recommendations for the time period can vary, depending partly on the...