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Four tests â thyroid-stimulating hormone (TSH), Free T3, Free T4 and thyroid antibodies â are required to accurately assess the function of the thyroid gland, our master gland of metabolism. An optimal TSH level should be less than 2.0, not the currently accepted 4.7 reported by most labs.
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.