Feeling colder than usual
Iodine deficiency can reduce resistance to cold. Some studies show that more than 80% of people with low thyroid hormone levels may feel high sensitivity to cold temperatures. Since iodine is required to produce thyroid hormones, an iodine deficiency may reduce your thyroid hormone levels. The thyroid hormone also helps control the rate of metabolism. In the presence of low thyroid hormones, your metabolism rate may reduce significantly. A slower metabolism produces less heat, which may make you feel colder than normal.
In addition, thyroid hormones help increase the activity of your brown fat, a form of fat that helps produce heat. This means that low thyroid hormone levels caused by iodine deficiency can slow down the activities of brown fat.