Lower levels of insulin means the fat is able to get out of the fat stores, which leads the body to start burning fat instead of carbs. Moreover, the kidneys will be able to shed excess sodium and water from the body, since insulin levels and fluid retention are correlated. A 2007 study published in the journal Renal Physiology, found the decrease in insulin levels led the participants’ kidneys to retain less sodium and water, reducing both body fat and water weight.