Final answer:
A Graves' patient with thyrotoxicosis should not be given substances that stimulate the production of thyroid hormones, such as iodine.
Step-by-step explanation:
Graves' disease is a condition characterized by hyperthyroidism, where the thyroid gland produces an excess of thyroid hormones. Therefore, a patient with thyrotoxicosis, which is a severe form of hyperthyroidism, should avoid substances that stimulate the production of thyroid hormones. One such substance is iodine, so foods and medications containing high levels of iodine should not be given to a Graves' patient with thyrotoxicosis. Examples of these include iodized salt, seaweed, and iodine supplements.