Many people know that eating roughage is good for health, eating roughage has become a kind of health fashion, selling roughage counter, business is also very prosperous. But eat coarse grains, but also to pay attention to the method, eat the wrong instead of harmful to the body. It is understood that, due to simple processing, coarse grains do save a lot of fine grains in the nutrition, such as dietary fiber is more, and rich in B vitamins and so on. However, eating coarse grains is not more good, if the intake of fiber is too much, but will affect the body’s absorption of protein, inorganic salts and some trace elements. Excessive consumption of coarse grains not only does not promote digestion, but also affects digestion and absorption. From the point of view of coarse grains should be coarse grain fine, more conducive to health. In addition, the long-term use of coarse grains as the main food will lead to malnutrition and reduced immunity. For women during pregnancy and breastfeeding, as well as adolescents who are in the growth and development period, eating more coarse grains will do more harm than good.” And drink plenty of water when eating coarse grains. There are fewer nutrients in coarse grains, so people who want to lose weight should not live on coarse grains alone.