The fundamental law of yin and yang is the first law of the universe, and everything in the universe is composed of two opposite substances, yin and yang. Man is made up of yin and yang, one part is tangible body, and the other part is intangible consciousness, soul and spirit. According to Marxist philosophy, a material world, a spiritual world. The same is true of food. There are visible solid or liquid foods that can be understood by common sense, which we call positive foods, and invisible gas or light foods, which we call negative foods. The essence of Taoist health preservation-Pigu, is to let people enter the realm of cutting off normal food, that is, not eating, but using negative food to maintain normal life activities. The popular fasting therapy in western countries can only do the former, but it doesn't have the skill and wisdom of "eating" negative food unique to Taoism. Therefore, fasting or dieting are two fundamentally different concepts from Taoism and must be correctly understood.

So how do you get negative food? "Harmony between man and nature" is an important concept in China traditional culture, which embodies the true meaning of holographic universe. In other words, the universe is the "big ego" closely related to human life information, and human beings are the "small ego" in the microscopic world of the universe. In what way can heaven and man be fully integrated and accommodating?

There are four channels for the integration of heaven and man: one is the valley gas channel. This is done by the digestive system. This is the passage where we usually eat. Cosmic energy is transferred from one organism to another. Plants convert cosmic light energy into plant functions through photosynthesis. Animals eat plants and transform the functions of plants into the functions of animals. Humans eat animals and plants in order to transform the functions of animals and plants into human functions, thus obtaining energy. Therefore, the animals and plants we eat are nothing more than carriers of cosmic energy, and we obtain cosmic energy indirectly through food. The second is the air tunnel. Through the respiratory system. The third is the channel. Qi inside and outside the body is communicated through pores and acupoints on the whole body surface; The fourth is the midvein channel. It is a high-speed channel for absorbing and storing energy formed by artificially opening the midrib. These four channels have the same function, which is to ensure the continuous exchange of material and energy between the human body and the universe in order to maintain vigorous vitality. The first two channels have long been summarized by modern science. In the latter two channels, ordinary people have degenerated.

Taoist Pigu is an intermediate process of temporarily closing the channel of valley gas. With the blessing of the master, the channel of activating the midrib is reopened, so that the midrib can directly communicate with the energy of the universe and obtain energy directly without the need for animals and plants to convert energy. This is negative food, not eating, but eating the invisible negative food in the universe. The positive tangible food we usually ingest makes human organs suffer strain and wear in the process of digestion. If it cannot be transported and metabolized, it will also form toxins. However, passive eating with direct energy intake still has energy sources, but it only avoids these problems. Therefore, eating well and eating fully passively also makes the organs that have been strained and worn out recover and get a new life.