The level of oxidative decomposition and utilization of sugar in the body is rising, the level of stored sugar is relatively low (due to the relative shortage of insulin), and the secondary catabolism of protein and triglycerides is greatly strengthened. All these will lead to the energy production exceeding the normal level, and the basal metabolic rate (BMR) is an index representing the energy metabolism per unit time in the basic state, so it will definitely increase together.