Some experts believe that a person with Hashimoto disease should avoid cereals that contain gluten, aspartame, unsaturated oil and products made from genetically modified soybeans, says The Science of Eating. Other experts believe that a patient's diet has no effect on the disease, says MedicineNet.
Gluten is a protein found in wheat, rye, barley and triticale, claims The Science of Eating. People who have celiac disease, a condition in which the body cannot tolerate gluten, are more at risk for Hashimoto disease. Some experts believe that the cells of the thyroid and gluten resemble each other, and the body, mistaking the thyroid for gluten, attacks it.
Aspartame is an artificial sweetener made from amino acids, says the American Cancer Society. Though it is safe for most people, some believe that people with Hashimoto disease should avoid it, because it has some kind of deleterious effect on the thyroid gland.
Interestingly, some people believe that patients with Hashimoto disease should avoid iodized salt, even though the thyroid needs iodine to function properly, claims The Science of Eating. A person can't eat enough salt to get the recommended daily dosage of 150 micrograms of iodine, and other additives are put in iodized salt. It is better to get the necessary iodine from raw sea salt.