Formation of Urine in the Body
Tibetan medicine claims that the urine excreted undergoes the following process of change. When a man takes food and drink each day, it passes through the mouth and enters the stomach, where food is digested through the action of badkan myad byed (Digestible badkan). It is further digested by mkhris pa 'jud byed, similar to that of chemical digestion in modem medicine. Further digestion is performed by the fire-accompanying rlung to separate it into essence anddross. The latter is further separated into concentrated and diluted parts whenit enters the small intestine. The concentrated part enters the large intestine to become stool, while the diluted part enters the bladder and becomes urine.

The essence portion in the stomach enters the liver to become blood disease, whichis further decomposed into essence and dross. The former is transformed into muscles, and the latter is stored in the gallbladder as bile.
Tibetan medicine claims that the bile is composed of two parts. One is the essence that it is distributed over the whole body as "yellow fluid," which is also one part of the body existing in an appropriate amount; too much or too little leads to disease. The dross part entering the bladder and becoming the precipitation is extremely scarce and evenly distributed, hence it is almost invisible and hardto find.

In summary, urine comes from foods taken in everyday. Hence, the quality of urine is closely connected with the food, especially the pigment it contains.Too much intake of pigment affects the charcteristics of the urune.

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