The dichotomy of "Kang Yang" is an important measure to improve the health level by relying on the essence of China's traditional diet and combining modern human health research theory, through the management of daily diet and scientific compatibility (rather than diagnosis and operation). It organically integrates the physiological laws of human body with the scientific and technological achievements of modern nutrition, and establishes a healthy model of "prevention instead of treatment, food instead of medicine, nutrition instead of medicine, and combination of physical conditioning and physical improvement". Its appearance marks that human health concept has entered a new era of scientific food and nutrition.