Drinking lemon water has some effect on lowering blood sugar, but it has little effect. Lemon water contains a large amount of vitamin C and vitamin B1, and contains iron, calcium, phosphorus and some electrolytes. Drinking lemon water for people with high blood sugar or diabetes can improve sugar metabolism and lipid metabolism to some extent, while increasing some electrolytes. However, be careful not to add sugar-containing ingredients, including brown sugar, white sugar, rock sugar, yellow sugar, honey, etc., when drinking it, otherwise it will easily lead to an increase in blood sugar. If you drink some lemon water with added sugar, not only will it not lower your blood sugar, it may also raise it. Patients with high blood sugar or diabetes should not rely too much on drinking lemon water to achieve the purpose of lowering blood sugar, but must follow the scientific method to lower sugar correctly. Lowering sugar is mainly controlled by controlling diet, proper exercise, medication, and timely monitoring of blood sugar, through which blood sugar is made to run in a stable state. Patients with hyperglycemia or diabetes try to control their blood sugar within a relatively normal range, such as fasting blood sugar of 6.5-7.5 mmol/L and 2 hours postprandial blood sugar <8.5 mmol/L. The better the control of blood sugar, the less likely acute complications will occur, and it can also inhibit the development of chronic complications of diabetes, which is beneficial to the overall health of patients. Patients must use scientific methods to lower their blood glucose correctly and not listen to rumors that may have a bad effect on their disease.