The brown fat has iron in its mitochondria that will facilitate production of a protein that releases the energy generated from metabolism as heat.
Your body produces the hormone norepinephrine when it becomes cold. Norepinephrine receptors are present in brown fat. These receptors alert the many mitochondria to begin producing energy when they detect the hormone. You will feel warm as a result, which will aid in regulating your body temperature. It basically produces proteins that releases the energy generated from metabolism as heat.
Brown fat converts fat molecules and blood sugar (glucose) into heat and contributes to the regulation of body temperature. Brown fat is activated by cold temperatures, which causes a number of metabolic changes in the body. But the majority of our fat is white fat, which can store extra energy. In obesity, too much white fat accumulates.
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