The cold winter season has new challenges for people with diabetes. In winter, due to the cold climate, people have less outdoor activities and less exercise, so if the amount of food eaten remains the same, there will be a rise in blood sugar; due to the cold, people will increase their food intake to counteract the cold, so the amount of food eaten increases, leading to blood sugar fluctuations; the stimulation of the cold will increase the secretion of glucagon in the body, leading to a rise in blood sugar. Therefore, we remind all diabetic patients to pay attention to keeping warm outside, especially to keep their heads warm. Stop outdoor exercise, you can exercise indoors, control your diet, and wish patients a safe winter.