As a master of our metabolic rate, thyroid hormones affect every cell in the body activities. With thyroid hormone deficiency is characterized, our metabolism slows down, which can cause weight gain, even when proper diet and exercise in place.
Weight loss is not the only symptom of thyroid hormone deficiency. Other symptoms may include feeling cold, very dry skin, lack of or reduced ability to sweat during exercise, hair loss, irregular menses, constipation, unexplained fatigue, depression and poor concentration.

Because the amino acid tyro sine and the mineral iodine, zinc and selenium is essential for the production of thyroid hormones, diet and nutritional intake is closely related to production. Sometimes tyrosine along with a multivitamin supplement high quality can be useful in preventing or improving symptoms of mild thyroid hormone deficiency. A marked deficiency diagnosed by blood tests may require thyroid hormone replacement.