Defensive energy: part of yang qi. It is strong and can reach every corner, running quickly and lively. As the first line of defence against disease, it has the ability to protect the skin and block external evils.

1. Qi Bo said that the vital energy of human beings is translated from food and water. The stomach (like an official in charge of a granary) tells the lungs (the prime minister): the amount is up to department standards.
2. Digested and assimilated in the stomach, water and grain become refined nutrious substances and then enter into the lungs and liver.
3. So all the organs receive nutrition. How fair it is! Intestines, heart, stomach, spleen and lungs.
4. The clear portion is called constructive energy, the turbid, defensive energy.
5. Constructive energy moves througt vessels, defensive energy moves outside the vessels. Both keep moving all over the body.
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