The benefit of eating roughage in moderation is that it can supplement the body’s nutritional requirements to a certain extent, but it is not recommended that long-term excessive intake, so as not to cause gastrointestinal discomfort. The types of coarse grains are diverse, mainly including cereals, miscellaneous legumes, tubers, such as millet, corn, sorghum, oats, soybeans, potatoes, yams and so on. The nutritional value of coarse grains is high, and most of them are rich in protein, vitamins, dietary fiber and minerals such as iron, magnesium, calcium and sodium. Moderate intake of coarse grains can provide the body with some of the nutrients, to a certain extent, to meet the body’s normal physiological and biochemical energy needs. Most of the population can eat coarse grains, but the active ingredients of coarse grains are limited, and do not have the same efficacy as drugs to treat diseases. It should be noted that the consumption of coarse grains need to be moderate, too much coarse grains may affect digestion. It is recommended to combine coarse and fine food with other nutritious food to achieve balanced nutrition.