Patients with high blood sugar can eat onions to supplement the nutrients, there are certain benefits, but onions can not play a therapeutic effect of lowering blood sugar. Onions contain carotene, vitamin C, potassium, calcium and other nutrients, can play a certain protection of blood vessels, antioxidant and other functions, and onions of the glycemic index is not high, after eating will not cause greater fluctuations in blood glucose, so patients with high blood sugar eating onions can supplement the nutrients to promote the health of the body. However, onions do not have the therapeutic effect of lowering blood sugar. In daily life, patients with high blood sugar should maintain a healthy diet and lifestyle, avoid eating fried food, fatty meat, cream cakes, etc., and also take appropriate physical exercise. Patients diagnosed with high blood sugar should actively cooperate with doctors for treatment.