Some 11 million Americans have either a hypothyroid (low, underactive) or a hyperthyroid (overactive) condition. Thyroid hormones control and regulate digestion, heart rate, body temperature, sweat gland activity, nervous and reproductive system, general metabolism and body weight.
Just because you don’t have a goiter does not mean that you have enough iodine. Deficiency has been recently associated with breast and prostate cancer. Iodine in combination with the amino acid tyrosine is manufactured into the thyroid hormone thyroxin. Iodine intake is usually insufficient, and since Americans have begun restricting their salt intake at the advice of their physicians, deficiency has become epidemic.