There is no direct relationship between taking insulin and the length of a person’s life. Some people with diabetes need insulin, and if they do not take insulin and allow their diabetes to progress, it may affect a person’s life expectancy. Some people with diabetes need insulin for treatment. Insulin can lower the blood glucose level in the body and prevent acute complications, such as hyperglycemic hyperosmolar state and diabetic ketoacidosis; at the same time, it can delay the time of chronic complications, such as diabetic foot, diabetic nephropathy, diabetic macroangiopathy, etc. Both acute and chronic complications can be life-threatening, so using insulin as prescribed to prevent complications can prolong the life of diabetic patients. However, patients must use insulin as prescribed by their doctors to avoid excessive dosage, which can cause hypoglycemia, which can seriously threaten patients’ lives. If the treatment is not timely, it can lead to the death of diabetic patients within a short period of time.