The glycemic index of onion is 30, the sugar content is relatively low, diabetic patients can eat properly. Onion glycemic index is low, 100 grams of onion carbohydrate content of about 5 to 8 grams, so diabetic patients are advised to eat onions, but also pay attention to the balance of the diet, will be a day of carbohydrate composition, fat composition, protein composition fixed in a reasonable proportion. Diabetic patients with staple food intake a day about 5 two ~ 6 two, vegetables can be a day about 500g, pay attention to the exchange of calories between each vegetable, pay attention to nutritional diversity, do not form the habit of partiality, but not conducive to the treatment of diabetes. Diabetic patients can also choose to eat fruits, when the blood glucose level is stable, you can choose low-calorie fruits, such as grapefruit, dragon fruit, etc., it is recommended to be taken between meals, when there is a sense of hunger, you can also eat tomatoes or cucumbers and other vegetables with a relatively large size, is also conducive to enhance the sense of satiety. Dietary treatment for diabetic patients is a basic treatment, it is recommended to consult the endocrinology department of regular hospitals.