Blood glucose may fluctuate more easily in winter and may be related to cold weather, reduced exercise and increased appetite. It is recommended to monitor blood glucose and seek medical attention as soon as possible if you feel unwell. When it is cold, adrenaline secretion in the body increases, leading to a rise in blood glucose. If you are in the north, where there is indoor heating, the large temperature difference between indoors and outdoors also tends to cause blood sugar fluctuations. Around winter, people tend to eat high-calorie foods because of the cold weather. At this time, patients with high blood sugar need to pay attention to avoid eating too much fat, sweet and thick-flavored things, and should adhere to a low-fat, low oil, low-salt diet. When the weather is cold, outdoor exercise is relatively reduced, resulting in slower metabolism and higher blood sugar. For patients with high blood sugar, before and after winter, they should pay attention to keep warm, increase the amount of exercise, adjust the diet structure, and pay attention to regular monitoring of blood sugar.