Hypoglycemia once hungry may be a precursor to diabetes. Obese diabetic patients have delayed peak insulin secretion, resulting in inappropriate secretion of insulin, insulin peaks in the absence of food in the body, resulting in preprandial hypoglycemia, leading to the phenomenon of hypoglycemia when hungry. In addition, people who are picky about food, skip breakfast or have anorexia and other dietary irrationalities can also experience hypoglycemia when they are hungry, so it is recommended to standardize the diet, enhance the nutrition, and make sure that the three meals are regularly and reasonably eaten. It is recommended to go to the hospital in time to improve the relevant examination, clarify the cause of the disease, and carry out standardized treatment under the guidance of the doctor.