Holistic healing focuses on bring the body back to balance as a 'whole' unit. Holistic healers don't see the body as compartmentalizes, i.e. heart disease is simply the heart showing the greatest effects of underlying biochemical imbalance and health issues.
It is understood that this is done as naturally as possible. There is now a comprehensive amount of science to back up the ways in which this can be done quickly and efficiently, and in doing so allow the body to heal much by itself and reverse and prevent illness processes.
www.newmedicinefoundation.org has much more on this and other topics.