In early Theosophy it was postulated that both the physical body and its energy body draw a portion of their nutrition from a type of energy known as Prana in the Vedic Traditions, and Chi or Vital Force in other practices. This assimilation is done through a non-physical network of energy acquisition points called Chakras in Sanskrit.
The PDF file here is a paper that I did for the SMOP group in 2014 that describes the Chakra System and how its functionality affect both the physical and emotional states of the individual.