Fasting blood sugar 17.4mmol / L, the need for a low-sugar diet, usually can be appropriate to eat fruits such as grapefruit, apples, etc.; can be appropriate to eat vegetables such as cucumbers, tomatoes, celery. 1. Fruits: diabetic patients are not suitable to eat too high glycemic index, high sugar content of food, grapefruit glycemic index of 25, sugar content of 5% to 7%, belongs to the low glycemic fruits; apple glycemic index is generally 36, sugar content of about 10%. Diabetic patients can eat this kind of fruit appropriately. 2. Vegetables: the glycemic index of cucumber is only 15, with a sugar content of about 2%; tomato has a glycemic index of 15, with a sugar content of about 2%; celery has a glycemic index of 25, with a lower sugar content. Including other green vegetables similar to the above foods, such as leeks, cabbage, etc., can be eaten by people with diabetes. It should be noted that, although the above food relative to other foods more suitable for diabetic patients to eat, but diabetic patients need to ration their diet, be careful not to eat too much. In addition, it is recommended that patients with fasting blood glucose 17.4mmol / L in a timely manner to seek medical attention, improve the relevant examination, standardized treatment under the guidance of the doctor.