This what I found online...
To increase the effectiveness of your upcoming radioactive iodine therapy, you may be prescribed a low iodine diet. Iodine
is used in the care and feeding of animals and as a stabilizer and/or safety element in food processing. Therefore, it may be
found in varying amounts in all food and beverages. The highest sources (and those to be avoided) are iodized salt, grains
and cereals, white bread, fish from the sea, shellfish, beef, poultry, pudding mixes, milk and milk products. Detailed recipes
that follow a low iodine diet can be found on the following websites:
Light of Life Foundation - Light of Life Foundation (Light of Life Foundation)
and
ThyCa: Thyroid Cancer Survivors' Association (ThyCa: Thyroid Cancer Survivors’ Association). Below are general guidelines to follow on this diet.
Additonal read:
http://www.thyroid.org/wp-content/uploads/patients/brochures/LowIodineDietFAQ.pdf
Avoid the following foods
• Iodized salt, sea salt, foods high in salt, baking soda and sodium
• Any vitamins or supplements that contain iodine (especially kelp and dulse)
• Milk or other dairy products including ice cream, cheese, yogurt and butter
• Seafood including fish, sushi, shellfish, kelp or seaweed
• Foods that contain the additive carrageen, agar-agar, alginate, or nori
• Cured and corned foods (such as ham, lox, corned beef, sauerkraut, cold cuts)
• Commercially prepared bakery products that could be made with iodate dough
conditioners
• FD&C red dye #3 - this appears in many foods or pills that are red or brown,
including colas, and in maraschino cherries
• Egg yolks, whole eggs and foods containing whole eggs
• Dried fruits
• Canned vegetables (salt-free canned vegetables are fine)
• Most chocolate (due to milk content)
• Blackstrap Molasses (unsulfured molasses is fine)
• Soy products (soy sauce, soy milk, tofu)
foods thAt Are oK
• Non-iodized salt may be used as desired
• Egg whites
• Fresh noncured meat from the butcher
• Homemade bread made with non-iodized salt and oil (not soy!) instead of butter
or milk
• Most fresh fruits and vegetables (but not too much spinach & broccoli), washed
well
• Frozen vegetables that don’t have high-iodine ingredients (like regular salt) added
• Grain, cereal products and pasta without high iodine ingredients
• Canned peaches, pears and pineapples
• Natural unsalted nuts and nut butters (peanut, almond, etc)
• Clear sodas, beer, wine, lemonade, fruit juices
• Non-instant coffee ortea, as long as it’s madewith distilledwater. Butremember,
only non-dairy creamer!
• Popcorn popped in vegetable oil or air popped, with non-iodized salt
• Black pepper, fresh or dried herbs and spices, all vegetable oils
• Sugar, jam, jelly, honey maple syrup
• Matzoh crackers (unsalted)