In his video, "The Biology of Belief", cell biologist Bruce Lipton, Ph.D. describes how the body is digital in nature. It either codes and prepares for danger i.e. fear/protection, or love/healing. The greater the percentage of the body's cells that are in protect mode, the less is available for growth and healing. He clearly shows how our beliefs shape and change our DNA. The body's cells have antenna that receive messages from the environment and our brain. When we focus on fear, our body goes into a defense mode and becomes sympathetic dominant.