It is a vast and complex subject given the number of factors involved in health and healing. For instance too much care of body may be due to an obsession, or out of fear in which case these psychological factors undo the good by exercises etc. Most important is the principle balance and moderation, and a simple happy harmonious life, a calm mind and having faith in God.
In our present condition, it is best to combine self-healing alongwith the use of gentle, mild medicines. Faith in cure and the will to get well are two most important factors in healing.
For detailed understanding you may hear relevant talks and read various related talks on Auromaa.org
Affectionately,
Alok Da