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The thyroid hormone process begins when the pituitary gland in the brain produces thyroid-stimulating hormone (TSH). TSH then acts upon the thyroid gland to produce thyroid hormones. The two main thyroid hormones produced are thyroxine (T4) and triiodothyronine (T3). Although the thyroid gland produces more T4 (80 percent) compared with T3 (20 percent), T3 is 300 percent more active than T4 and is the thyroid hormone responsible for increasing metabolism. In fact, much of the T4 is converted into the more active T3 inside the cells of the body.
Share. Your metabolism is your bodyâs biochemical activity that regulates the conversion of calories into energy. A slow metabolism is slow to convert calories into energy and can cause the body to store fat. A fast metabolism operates in converse fashion, quickly using energy and not storing it.Your bodyâs metabolism is controlled by your thyroid gland and a sluggish thyroid can cause metabolic deficiencies, leading to an increase in fat stores. In fact, an inefficient metabolism is a very common causes of weight gain. fast metabolism operates in converse fashion, quickly using energy and not storing it. Your bodyâs metabolism is controlled by your thyroid gland and a sluggish thyroid can cause metabolic deficiencies, leading to an increase in fat stores. In fact, an inefficient metabolism is a very common causes of weight gain.