Gestational diabetics can consume oats, compared with refined rice, white flour and other fine grains, oats are rich in dietary fiber, dietary fiber can prolong the retention time of food in the stomach, slow down the rate of glucose absorption, which can reduce the magnitude of postprandial blood glucose elevation, so oats have a lower glycemic index, which is more conducive to preventing the emergence of hyperglycemia. Dietary fiber can reduce the level of cholesterol in the body, but also can promote gastrointestinal peristalsis, in the intestines to absorb water and expansion, with the role of softening stools, constipation during pregnancy is good. Therefore, gestational diabetes patients can use oats to replace part of the refined rice and white flour as staple food. However, due to the carbohydrate content within the oats, i.e., energy, and fine grains, the difference is less, every 25g can produce 90 calories of energy, so it can not be due to its benefits of regulating blood glucose and preventing constipation, without control, otherwise it may lead to energy intake more than the body’s needs.