For Chinese people nowadays, diabetes is a very common disease, and this disease has a great impact on many patients. A distinctive feature of diabetic patients is high blood sugar, and thus, in people’s perception, high blood sugar becomes synonymous with diabetes. Patients go to the hospital for examination and find high blood glucose, and irresponsible doctors misdiagnose the disease as diabetes and prescribe hypoglycemic drugs to the patients, which eventually leads to the patients forming lifelong dependence on the drugs and becoming diabetic. In fact, diabetes and high blood sugar are two different diseases, but they are only related to each other. Diabetes is caused by the disorder of the endocrine system, resulting in the dysfunction of sugar metabolism. Hyperglycemia refers to the high level of sugar in the human blood. Diabetes causes hyperglycemia, but hyperglycemia is not necessarily diabetes. Recognize what is high blood sugar? Our bodies need a lot of nutrients through food, and sugar is one of the essential nutrients. Sugar is taken into the body through foods such as cereals, granulated sugar, fruits, and potatoes, and is then formed into glycogen, which is stored in the liver and muscles, or converted into glucose that enters the bloodstream and is transported to cells throughout the body as a source of energy for muscle movement. The concentration of glucose in the blood is often referred to as “blood sugar”. Under normal circumstances, blood glucose varies frequently, especially after a meal, and the pancreas secretes insulin, which promotes the absorption of glucose and its consumption as calories. Therefore, about an hour after a meal, blood sugar begins to fall, and basically returns to normal two hours after a meal. However, if too much sugar is consumed, the glucose that cannot be consumed will remain in the blood. Excess glucose requires a lot of insulin to promote absorption, and in the long run the pancreas becomes fatigued to the point of functional decline, and gradually becomes unable to secrete insulin smoothly. As a result, blood glucose rises and remains high on an empty stomach or two hours after eating, creating a state of hyperglycemia in which the blood becomes sticky and easily clots. The red blood cells in healthy blood are flexible and can flow smoothly even in very thin capillaries. However, in a hyperglycemic state, the red blood cells lose their flexibility and become hardened, and multiple red blood cells overlap and stick together, easily blocking small blood vessels and becoming a cause of blood clots. How exactly do you determine if it is diabetes? Diabetes mellitus is a series of metabolic disorders such as sugar, protein, fat, water and electrolytes caused by genetic factors, immune disorders, microbial infections and their toxins, free radical toxins, mental factors and other pathogenic factors that cause hypoglycemia and insulin resistance in the body. Diabetes mellitus (blood glucose), once poorly controlled, can lead to complications, resulting in kidney, eye, foot and other parts of the failure of the disease. The relationship between diabetes and hyperglycemia shows that hyperglycemia and diabetes are two different diseases, but they are related to each other. Diabetes is caused by the disorder of the endocrine system of the human body, resulting in the dysfunction of sugar metabolism. Hyperglycemia refers to the high level of sugar in the human blood, and diabetes can lead to high blood sugar. However, it is certain that the blood sugar level is higher in diabetic patients, which is the commonality between the two. For healthy people, it is also a red flag if they do not pay attention to their diet for a long time, resulting in high blood sugar levels, because the sticky, high glycemic blood is also harmful to blood vessels. The combination of sugar in the blood and the proteins in the blood vessels will form glycated proteins, which are harmful proteins that cannot achieve the function of proteins, cannot be metabolized properly in the body, and are prone to vascular injury and atherosclerosis. In the long run, it will induce the occurrence of diabetes. For patients with type 2 diabetes caused by obesity, although the symptoms are all high blood sugar, it may be insulin resistance or impaired islet function… Therefore, the patient’s suitability for sleeve gastrectomy or gastric bypass surgery can only be determined after a thorough preoperative examination.