According to the traditional health preserving theory, life consists of three kinds of energy: essence and spirit, which are divided into acquired energy and innate energy. Essence refers to Shui Gu's acquired essence, namely diet, nutrition and water. Congenital essence refers to meta-essence. Qi refers to acquired qi, innate qi and vitality. God refers to the acquired sunshine, and the innate yuan God is empty. It can be seen that the three elements of life and health are (acquired) air (gaseous), water (solid liquid) and sunshine. ?

Innate vitality is the basic material energy of life, and acquired vitality is the energy factor to ensure the healthy growth of life. First look at the essential state: solidified liquid, all food is decomposed into fine particles in the body, mixed with water, flowing in the body as liquid, and absorbed and utilized. In this process, all essential nutrients are separated in the process of decomposition and transported to various parts of the body for supply according to the needs of the body. ?

Let's look at the state of gas: liquefied gas state. After air is inhaled into the body, it is mixed with liquid and liquefied. At the same time, various gaseous nutrients in the air gather in the body and are transported to various parts of the body together with subtle substances and nutrients. ?