Corn does not usually lower blood glucose, and an effective way to lower blood glucose is through medically prescribed hypoglycemic therapy. Corn has a glycemic index of 55, which is a medium GI food, and it contains a large amount of carbohydrates, which are broken down in the body to produce glucose, and a large amount of intake will result in an increase in blood glucose values. Therefore, corn has no role in lowering blood sugar. However, diabetic patients consume corn in moderation, the general impact on blood sugar is not great. Corn is rich in dietary fiber, vitamin C and other nutrients, which have the effect of replenishing nutrients and increasing satiety. Therefore, diabetic patients with good blood glucose control should eat some corn in moderation, but pay attention to moderation and consult a specialist when necessary. It is recommended that patients with diagnosed diabetes go to the hospital in a timely manner, follow the doctor’s instructions to regulate oral acarbose, metformin and other hypoglycemic drugs, insulin injections, with diet and exercise therapy, in order to reduce blood sugar. Do not believe in folk remedies, so as not to delay the condition.