Which approach to health care focuses on prevention of illness and disease and is aimed at treating the whole person-body and mind-rather than just the part or parts in which symptoms occur?

The answer is psychophysiology.

Explanation:

As the name suggests, psychophysiology concernrs how both psychological and physiological factors affect a person's health. It branches into different specializations such as cognitive neuroscience.

This science also studies how a variety of stimuli has a reaction in human emotions, and how thiese emotions are linked to physiological responses (e. g. sweating or increased blood presure).