What is whole grain and what kinds are there?

Coarse cereals generally refer to food crops, which is a general term for food crops.

Cereals refer to: rice, wheat, soybeans, corn and potatoes. At the same time, grains other than rice and flour are customarily called miscellaneous grains. In Huangdi Neijing, the five grains are called "japonica rice, adzuki bean, wheat, soybean and yellow rice", while in Mencius Teng Wengong, they are called "rice, millet, millet, wheat and oat", and in Buddhist sacrifices, they are also called "barley, wheat, rice, adzuki bean and flax". There is also a saying that grains generally refer to five crops, namely "hanging, rattan, root, horn and ear".