Unstable blood sugar can eat a small amount of apples, pears, grapefruit and so on. Unstable blood sugar is common in diabetic patients, diabetic patients need to maintain a low-salt, low-fat, low-sugar diet, in the choice of fruits also try to lower glycemic index of the fruit-based, such as apples, glycemic index of 36; pears, glycemic index of 36; grapefruit, glycemic index of 25; cherries, glycemic index of 22. The above fruits not only have low glycemic index, all belong to the low glycemic index food, but also rich in dietary fiber, vitamins and other nutrients; although this kind of fruit has a certain nutritional value, but it is not recommended to eat a large number of patients with unstable blood glucose at one time, which may lead to large fluctuations in blood glucose. In daily life, patients with unstable blood glucose should also take appropriate physical exercise, which helps to enhance insulin sensitivity. Patients diagnosed with hyperglycemia should actively cooperate with doctors for treatment.