If your blood sugar is abnormal, your blood sugar will still be high if you don’t drink water for a day, and it will not be lowered, but even higher, so it is not recommended that you don’t drink water for a day. The amount of water consumed in a healthy person does not significantly determine the level of blood glucose, the human pancreatic β-cell secretion function is normal, the human body itself will be based on the concentration of blood glucose in the blood to regulate the secretion of glucagon, insulin and other hormones, so as to maintain the dynamic equilibrium of blood glucose. Therefore, a day without drinking water blood glucose changes little, will always remain within a certain range. However, for patients with hyperglycemia, high blood glucose is usually due to abnormal insulin secretion or produce insulin antagonism, at this time, the ability to regulate blood glucose is impaired, a day without drinking water blood glucose will not be lowered, and even because of the drop in blood volume may lead to elevated blood glucose. Therefore, patients should drink more water and receive regular glucose-lowering treatment. If the patient has abnormal blood sugar, it is recommended to consult a doctor for a clear diagnosis and targeted treatment. Simply by controlling the amount of water consumption can not achieve the effect of lowering blood sugar.