1. In the traditional health-preserving theory, diet is called cereal qi, and food combines with vitality in the body (also called qi between kidneys) to form qi, and the flow of qi supports the normal operation of life activities. What really supports life is the vitality in the true qi, and food plays an encouraging role. Food leaves physical properties in the body, which affects the normal flow of qi in the body and brings people all kinds of desires. Physical properties affect the circulation of qi and blood, which is easy to bring diseases to people. Although there is a gap between TCM theory and modern medical theory, there is no conflict. But this method and theory directly contradict the theory of modern medicine, but the reality speaks for itself. Some patients can only drink water for more than ten days and can't eat any food. Not only do they not feel hungry, but their physical condition has also improved. Don't deny this method and fact because modern medicine can't explain it. Modern medicine is still developing.

2. It can greatly reduce the diet and reduce the influence of' physical properties' on the body, so it has a cleaning function. In addition, Pigu can also stimulate the generation of qi between human kidneys, which was called water in the sky in ancient times. Therefore, it has the functions of regulating and enhancing immunity.