Blood sugar is an important component that sustains life in the body. Low blood sugar manifests as weakness and even coma. High blood sugar can bring a series of metabolic diseases. Once diabetes occurs, attention should be paid to: 1. limit the intake of food with high sugar content such as grain and fruit, and mainly consume food with low sugar content such as vegetables and beans; 2. choose hypoglycemic drugs reasonably, including three types to promote blood sugar metabolism, promote pancreatic islet function and inhibit sugar synthesis, and it is recommended to prefer biguanides, adjust hypoglycemic drugs under the condition of monitoring blood sugar, and choose the right type and the right dose.