Grains generally refer to rice, wheat, corn, soybeans and potatoes, and miscellaneous grains generally refer to grains other than grains, such as sorghum, millet, buckwheat, oats, barley, coix seed, mung beans and adzuki beans.

Because cereals are usually rich in dietary fiber, which can promote gastrointestinal peristalsis, digestion and other functions, help to relieve constipation and help to lose weight, and cereals are a kind of crude fiber food, which can increase satiety, reduce the intake of other foods and also help to lose weight, so generally speaking, eating cereals can help to lose weight.

The nutrients in cereals are mainly carbohydrates, followed by protein, and the fat content is not high. Ancient doctors believed that grain could nourish the qi of the five internal organs.

From 65438 to 0997, the Nutrition Society of China adopted the Dietary Guidelines for China Residents, the first of which is "Food is diverse, mainly cereals", which emphasizes that the energy necessary for people's daily life and protein should be mainly supplied by cereals, which is the main and fundamental source of nutrient intake.

It can be seen that food ranks first in people's diet structure. The ancients emphasized that the basic principle of "nourishing" is "fine collocation, omnivorous grains"