The physical deterioration we experience with aging is, in essence, the drying out of the cells. Our bodies' water content is diminished by sweat, tears, saliva and urine excrement. That's why urine is dark colored and smells strong when we are tired. I make a point to drink extra urine when I'm particularly tired, as I can feel its reinvigorating effects in a matter of 20 minutes.

In a way, people do not so much require a diet of solid food. Our craving for solid food comes purely out of habit. Although we only need enough calories to keep our bodies running, we tend to stuff ourselves until we feel full. Overeating is another major cause of illnesses. A Japanese saying suggests eating no more than about 80 percent of one's capacity. What I am trying to get across here is that a cupful of food should give us adequate energy if it has enough calories to sustain the body.

The life cycle of trees provides an example of the wonderful workings of nature. The autumn foliage marks the separation of the leaves from the tree and their return to the earth. Yet the falling of autumn leaves is not without meaning. The nutrients contained in the leaves return to the ground and supplement the energy for the tree itself. The return of the leaves to the earth is part of a complex process in which the tree is given renewed life in the spring. So the decay of autumn leaves is not a futile process, but a meaningful cog in the life cycle of nature.

I believe urine plays the same type of function. Humans are intrinsically equipped with the power to heal themselves and the power to resist illnesses. We produce just enough nutrients and energy to sustain this resistance system.

Humans, like all other animals, are part of the natural world. Other animals drink their own urine. And in the animal world, the mother will eat the umbilical cord that has protected the fetus and sent her nutients to it. People around the world are said to have traditionally eaten human umbilical cords and some people continue to do so today.