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Under the guidance of science, it is indeed beneficial to the health of the body, but the efficacy cannot be exaggerated, and the scientific principle needs to be studied.
Bigu is also called Gucci, Gucci, Digging Valley, Curved Valley and Broken Valley. Taoism believes that when people eat whole grains, feces will accumulate in their intestines, which will produce foul smell and hinder the road to longevity. Therefore, Taoism imitates the immortal behavior described in "Zhuangzi Xiaoyao Tour", hoping to achieve the goal of becoming immortal.
The ancients also often used crossing the valley as a method of health care. There is a saying in the book of washing marrow that "eating less will make you happy, and eating more will make you live longer". It can be seen that the valley has the function of prolonging life; Biography of Historical Records and Liu Hou: "Zhang Liang is sexually transmitted, that is, he does not eat grain." It is said that guiding the valley is a method of treating diseases. Anyone who walks in the valley should insist on eating gas and omnivorous medicine bait except cereal and wheat meals.
Begging for grain originated in the pre-Qin period, and it was about the same time as qi-moving. "Yi Ming Xin Bei" is a etiquette monograph before Qin and Han Dynasties. It says: "Carnivores are brave, food eaters are smart, gas eaters are alive, and those who don't eat are dead." It is the earliest theoretical basis of the art of crossing the valley. There is a similar record in Huainanzi Terrain Training. After the establishment of Taoism, many people inherited this technology and practiced the valley. From Han Dynasty to Song Dynasty, the art of divination valley was very popular in Taoism.
References:
Bigu-Baidu Encyclopedia