Usually, eating an apple blood sugar can rise 0.5-5mmol / L, but due to the specific circumstances of different, the specific rise in blood sugar value also varies. 1, the general population: if there is no diabetes, eat an apple blood sugar may not rise significantly, the rise may not be more than 0.5mmol / L, but the specific circumstances of the different people. Because the insulin of the general population is on-demand secretion, whether it is an apple, or pears, oranges, oranges, bananas and other sugary fruits, after its entry into the body, insulin can be rapidly secreted to control blood glucose in the normal range; 2, diabetic patients: if the blood glucose control is up to the standard, insulin and medication can play a role in a timely manner, to eat a normal-sized apple, the blood glucose generally rises by 0.5 mmol / L The effect on blood glucose is usually small. If diabetic patients have poor control, such as preprandial blood glucose in 8.0mmol / L or so, two hours after the meal blood glucose in 10.0mmol / L or 11.0mmol / L or so, this time to eat the apple and larger, blood glucose may rise 2-5mmol / L, the specific value of the different from person to person. In addition, factors such as the size of the apple, whether it is consumed with a meal or between meals, also affect the blood glucose of diabetic patients after consuming apples, making a big difference in the blood glucose values of different patients. It is best for diabetic patients to have their blood sugar control basically up to standard before eating apples, and they can choose to eat half an apple between meals.