I have long stated that a positive and optimistic attitude towards your health will armor your immune system.  Along with healthy diet, exercise, meditation, your attitude is vital to your overall health.  Picture your mind, body and spirit as three equal parts of a triangle.  Each of the three parts must remain strong and in tune with the others.  Then and only then are you achieving true over all  health.  Below  is further support for this notion.

Optimistic expectancies affect many psychosocial outcomes and may also predict immune system changes and health, but the nature and mechanisms of any such physiological effects have not been identified. The present study related law-school expectancies to cell-mediated immunity (CMI), examining the within- and between-person components of this relationship and affective mediators. First-year law students (N = 124) completed questionnaire measures of expectancies and affect and received delayed-type hypersensitivity skin tests at five time points. A positive relationship between optimistic expectancies and CMI occurred: Changes in optimism correlated with changes in CMI. Likewise, changes in optimism predicted changes in positive and, to a lesser degree, negative affect, but the relationship between optimism and immunity was partially accounted for only by positive affect. This dynamic relationship between expectancies and immunity has positive implications for psychological interventions to improve health, particularly those that increase positive affect.