If a diabetic patient has poor blood sugar control, weight loss can occur, and the exact amount of weight loss is related to the degree of elevated blood sugar and the degree of metabolic disorders in the patient’s body. For example, if the patient’s blood sugar is mildly elevated, weight loss is often not obvious and is not accompanied by obvious symptoms such as excessive drinking, excessive urination and excessive eating. If the patient’s blood sugar is significantly elevated, the weight will be reduced because the elevated blood sugar in the body leads to impaired sugar utilization and accelerated protein decomposition, which can lead to weight loss, and the higher the blood sugar, the heavier the metabolic disorder, the more weight loss. Therefore, if the symptoms of weight loss appear, it is necessary to monitor blood sugar in time to detect diabetes early and give standardized treatment as soon as possible.