In general, patients with gestational diabetes need to consider insulin therapy if their fasting blood glucose is still greater than 5.8 mmol/L after regular dietary control and their blood glucose is greater than 6.7 mmol/L 2 hours after breakfast or before dinner. Some patients with gestational diabetes can control their blood glucose by controlling their diet and increasing exercise to keep their blood glucose levels within the target range. Dietary control needs to be done in such a way that it meets the nutritional needs of the pregnant woman and the fetus without causing hyperglycemia or starvation ketosis. However, if control is not satisfactory, insulin is needed to control blood sugar. The use of insulin does not usually have adverse effects on the fetus, and medical advice is needed to monitor blood glucose and regular check-ups as required.