Whole wheat bread can be consumed for gestational diabetes, but it is not recommended in large quantities. Whole wheat bread is a staple food, rich in dietary fiber, which helps to replenish carbohydrates, replenish energy, enhance satiety, and promote defecation, etc. However, the glycemic index of whole wheat bread is 69, which is a moderate glycemic index food. However, the glycemic index of whole wheat bread is 69, which belongs to the medium glycemic index food, and it can be consumed in small amounts, but it is not recommended to consume a large amount of it, so as not to cause significant fluctuations in blood glucose. It is recommended that patients with gestational diabetes mellitus give priority to low glycemic index bread, such as barley, oat bran or mixed grains about 50% of the bread, the glycemic index is relatively low, the impact on blood glucose is smaller. Patients diagnosed with gestational diabetes mellitus are advised to maintain a low glycemic diet and actively cooperate with the doctor’s treatment