The production and utilization of blood glucose in normal people are in a state of dynamic equilibrium and maintained at a relatively stable level, which is the result of the fact that the sources and routes of blood glucose are roughly the same. The sources of blood glucose include: 1) from food digestion and absorption; 2) from the decomposition of glycogen stored in the liver; 3) from the conversion of fat and protein: In the human body, sugar, fat and protein can be converted to each other, and the process of conversion from fat and protein to sugar is called gluconeogenesis. The pathways of blood sugar include: 1) oxidation to energy; 2) conversion to glycogen for storage in the liver, kidneys and muscles; 3) conversion to other nutrients such as fats and proteins for storage. The important organs that regulate blood glucose in human body include: 1. liver: regulates blood glucose by storing and releasing glucose; 2. nervous system: regulates blood glucose by influencing on food, sugar intake, digestion, utilization and storage, and also indirectly influences blood glucose through endocrine system. 3. Endocrine system: secrete a variety of hormones to regulate blood sugar. The liver, nerve and endocrine system work together to maintain the stability of blood glucose.