The cornerstone of Chinese Metaphysics and Traditional Chinese Medicine has always been the 5 elements, namely Water, Wood, Fire, Earth, Metal.
The balance of the 5-elements denotes a balance of the body and thereby leading to a balanced life and health.
The 5-Elements are interdependent on each other and any excess or insufficiency throws the 5- Element cycle off.
Look at the diagram below.
Notice that there is a Production cycle where Water produces Wood, Wood produces Fire, Fire produces Earth, Earth produces Metal and finally Metal produces Water.
This is a continuous and ever forming cycle.
Next notice the Destruction cycle where Metal destroys Wood, Wood Destroys Earth, Earth destroys Water, Water Destroys Fire and Fire Destroys Metal.
This again is a continuous cycle and represents the Destruction of elements.
The Production as well as Destruction of the elements bring about the elemental balance that we depended upon for life, just like the cycle of birth and death.