Onions are usually known to raise blood sugar. Eating calorie-containing food usually causes blood sugar to rise, so eating onions can also cause blood sugar to rise. However, onions contain carotene, folic acid, phosphorus, potassium, calcium and other nutrients, and the glycemic index of onions is not too high, for patients with high blood sugar after eating onions not only will not cause a large fluctuation in blood sugar, but also supplement the nutrients, promote health. Whether it is healthy people or diabetic patients can be appropriate to eat similar to the onion so rich in vitamins, trace elements of vegetables; patients with diabetes should also comply with the doctor’s instructions to standardize the use of medication for glucose treatment.