Patients with diabetes should not eat bananas because the sugar, starch and calories contained in bananas are high among fruits, so eating bananas is very unfavorable to blood sugar control. If the patient usually has very good blood sugar control, he can eat a small amount of bananas between meals, which can satisfy his appetite and help delay the emergence of preprandial hypoglycemia and avoid eating too much at the next meal. But in general, bananas can cause significant fluctuations in blood sugar for most diabetics. So there is a wide variety of fruits, and patients can choose other fruits with lower sugar content, but try not to eat bananas.