Generally people who drink less water will not have high blood sugar, because what determines the level of blood sugar is the level of insulin and glucagon in the body. There are many glucagon hormones in the body, including adrenocorticotropic hormone, thyroid hormone, epinephrine, norepinephrine, glucagon, and the only one that lowers blood glucose is insulin. If the balance between glucagon and glucose-lowering hormones is disturbed, the glucagon hormone secretion decreases, and the glucagon hormone secretion increases due to other reasons, then it is easy for blood glucose to be elevated. Insulin is secreted on demand in a normal population and has little to do with how much water is drunk. However, if you drink too little water, resulting in dehydration of the body or reduced secretion of digestive juices, it is easy to lead to a drop in blood pressure, imbalance in body temperature regulation, and patients are prone to fever, in addition to urinary stones. If dehydration occurs, patients are prone to sunken eye sockets and reduced skin elasticity. Therefore, it is necessary to maintain sufficient intake of water, and the daily water intake of normal people is about 2000mL.