Roughage is food, not a substitute for drugs to help pregnant women with the effect of glycemic control, but for pregnant women with elevated blood sugar recommended consumption of oats, buckwheat, brown rice and other coarse grains to delay the peak of postprandial glucose, coarse grains slow glycemic rate, but also rich in dietary fiber, with the promotion of intestinal peristalsis, increase the sense of satiety, moderate consumption can provide the body with the required nutrients. Roughage its common point is not after further fine processing, retained gluten and other parts of the food. Oats, buckwheat, brown rice and other coarse grains contain a large number of trace elements and organic acids, can provide good nutrition for pregnant women. In addition coarse grains should not be consumed in excess, as they contain a lot of starch, and over-eating can lead to an increase in blood sugar. It may also lead to bloating and increase the burden on the intestines. Whole coarse grains as a staple food taste worse, and white rice together to make a mixed grain rice, appropriate eating in order to provide better nutrition for pregnant women. Pregnant women should pay attention to whether they are allergic to gluten when consuming coarse grains. The usual diet of coarse and fine mix, more helpful to maternal nutrition during pregnancy.