Final answer:
The intake of iodine increases thyroid hormones T3 and T4, which can prevent the formation of goiter.
Step-by-step explanation:
The thyroid hormones T3 and T4 are increased by the intake of iodine. Inadequate iodine intake can result in an inability to synthesize these hormones, leading to a condition called goiter. Goiter is characterized by the enlargement of the thyroid gland due to overproduction of TSH without the formation of thyroid hormones. This occurs because without iodine, the colloid in the thyroid gland accumulates and is not converted to thyroid hormone.