In modern times, cereals usually refer to rice, wheat, soybeans, corn and potatoes. At the same time, grains other than rice and flour are customarily called miscellaneous grains, so miscellaneous grains generally refer to food crops.
Huangdi Neijing is a comprehensive medical work, which establishes the theories of Yin and Yang, five elements, pulse condition, Tibetan image, meridians, etiology, pathogenesis, symptoms, diagnosis, treatment, health preservation and luck. Its basic material comes from the long-term observation of life phenomena in ancient China, a lot of clinical practice and simple anatomical knowledge.