The role of grains and cereals is to provide the body with the required carbohydrates and other nutrients, moderate consumption of human health benefits, it should be noted that the grains and cereals as food, does not have the efficacy of medicine. Grains and cereals is a collective term for food crops, including rice, soybeans, wheat, corn, etc., grains and cereals are rich in protein, carbohydrates, vitamins and dietary fiber and other components, and can provide a certain amount of energy, can be used as a good source of nutrients for the human body. Take corn as an example, every 100 grams of corn contains 196 calories, of which 23 grams of carbohydrates, 4 grams of protein, 1 gram of fat. However, grains and cereals are only common ingredients in daily life, not medicines, and therefore do not have any pharmaceutical effects. Although grains and cereals have certain benefits, but should not eat too much at one time, otherwise it is easy to aggravate the burden on the gastrointestinal tract, especially beans, but also lead to excessive intestinal gas production, causing bloating and gas and other uncomfortable symptoms. It is recommended that a reasonable combination of food, grains and cereals should be combined with meat and eggs, vegetables in moderation, balanced nutrition.