Hypothyroidism is the most common type of thyroid disorder. It means your thyroid gland is under performing. The job of the thyroid gland is to produce thyroid hormones which control how the body generates and uses energy. The thyroid hormones affect every cell and almost every organ in the body. When thyroid dysfunction happens, parts of the body functions slow down and result in a slower metabolism.[1] An impaired metabolic efficiency is closely correlated to low body tempe