In clinical work, we often encounter some “acute” diabetic patients, who are eager to bring down their blood glucose immediately, not knowing that this kind of “plucking” way of lowering blood glucose will produce many hazards to the body: 1, blood glucose drops too fast is easy to overkill Hypoglycemia: Hypoglycemia is no less harmful to diabetic patients than hyperglycemia. Mild hypoglycemia can cause sympathetic excitement, panic, sweating, hunger, and in severe cases, can lead to impaired consciousness, coma and even death. Hypoglycemia can also cause tachycardia and heart rhythm disturbance, inducing heart attack and sudden death. 2, blood sugar drops too fast will trigger hypoglycemic reaction: blood sugar drops rapidly, although the blood sugar value does not reach hypoglycemia, but because the body will cause uncomfortable reaction to the rapid drop of blood sugar, like panic and weakness, dizziness, pale, cold sweat and other symptoms similar to hypoglycemia. 3, too fast a drop in blood sugar will cause blurred vision: a rapid drop in blood sugar from a very high level will cause the osmotic pressure of the blood to drop, resulting in the transfer of water in the blood to the surrounding tissues, and when the water in the tissues of the eye increases, the refractive power of the eye will change and blurred vision will occur. 4, blood sugar will fall too fast will lead to increased blood sugar fluctuations: hypoglycemia can cause an increase in the secretion of insulin antagonist hormones such as adrenaline, growth hormone and glucagon, resulting in reactive hyperglycemia, making blood sugar high and low, which is unfavorable to diabetes control. 5, blood sugar drops too fast will damage brain cells: brain tissue mainly relies on glucose in the blood to supply energy, repeated episodes of hypoglycemia especially in the elderly can damage brain cells, causing memory loss, slow reaction, and even dementia. 6, too fast a drop in blood sugar aggravates neuropathy: a part of diabetic patients, especially the application of insulin to make a rapid drop in blood sugar can lead to the emergence of painful neuropathy, manifested as pain in the distal extremities or even extending to the whole body. Therefore, patients should not take rapid control of high blood glucose as the standard of good or bad diabetes treatment, mistakenly believing that the treatment plan that can control blood glucose quickly is good, while the slow speed of blood glucose reduction is bad treatment effect. Lowering blood sugar is an art, both safe and effective. It is necessary to keep blood sugar under long-term control to or close to the normal range, but also to avoid hypoglycemia or other serious adverse events caused by too fast and too rapid a drop in blood sugar.