There are no coarse grains that pregnant women absolutely cannot eat during pregnancy. Generally, coarse grains do not have the effect of activating blood circulation, so they will not affect the pregnant woman or the fetus when consumed in moderation, but the amount of coarse grains consumed should be controlled to avoid excessive peristalsis in the gastrointestinal tract, which will affect the digestion and absorption of nutrients and thus the growth and development of the fetus. Pregnant women may suffer from constipation due to changes in hormone levels and reduced daily activity. Coarse grains are relatively rich in fiber, and their moderate intake by pregnant women can help relieve or prevent the symptoms of constipation. Coarse grains can be divided by form into cereals such as corn, millet and black rice, miscellaneous beans such as soybeans, mung beans and red beans, and tubers such as sweet potatoes, yams and potatoes. Pregnant women who are not allergic to coarse grains can eat these grains in moderation if they are not spoiled or sprouted. Usually coarse grains are not a contraindicated diet for pregnant women, but they should try to avoid high-fat and high-sugar foods during pregnancy. Excessive intake of high-fat and high-sugar foods may cause the pregnant woman to be overweight, leading to over-nutrition of the fetus and even the occurrence of a huge baby, which may affect the process of natural delivery. In addition, excessive intake of sugar may also cause some damage to the body’s immune function, which in turn may affect the healthy growth of the fetus.