High blood glucose may be related to dietary factors, impaired pancreatic islet function, lagging insulin secretion, insulin resistance and other factors. 1. Dietary factors: If you eat a lot of food with high sugar content in a short period of time, it will easily lead to the increase of blood glucose in your body. 2. Impaired pancreatic islet function: damage to the pancreatic islet function leads to insufficient insulin secretion in the body, which in turn causes blood sugar to rise. 3. Lagging insulin secretion: Lagging insulin secretion can’t secrete enough insulin in time to lower blood sugar after meal or sweet food intake, which leads to the rise of blood sugar. 4. Insulin Resistance: Insulin resistance exists in oneself, even though enough insulin can be secreted, one’s self is not sensitive to the action of insulin, which leads to the rise of blood glucose. It is recommended that patients with high blood glucose improve their dietary habits and go to the hospital if necessary to find out the cause of the disease and then standardize the treatment.