Excerpt from The 100 Year Lifestyle:

Everything in your life that you consciously do, or your body does for you unconsciously, requires nerve supply. Everything!

Your body uses nerve supply to send communication signals back and forth between the brain, cells, tissues, organs and muscles.

Cells and Tissues

Healthy cellular function requires healthy nerve supply. Unhealthy nerve supply can cause your cells to function less than optimally effecting your health immediately and over time.

• In bone marrow stem cells, which are responsible for repopulating an individuals red blood cells, the lack of sympathetic nerve supply changes expression of protein markers for the cell and a decrease in certain types of stem cells. (Dubovy)
• The lack of innervation through the parasympathetic nervous system can change expression of immune of function cells, which in some animal studies has been shown to promote cancer growth. (Partek)
• Neurons can even self-regulate their own blood supply. For example, vision associated neurons in the eye have been shown to regulate proteins associated with increase in local blood vessel development, thus these neurons can self-regulate the amount of blood supply needed for optimal function. (Usui)

Source:  https:// the100yearlifestyle.com/life-takes-nerve/