I've learned that people who engage in positive thinking experience a host of health benefits.  Health benefits of positive thinking are increased life span, lower rate of depression, greater resistance to common cold, better psychological and physical well-being, reduced risk of death from cardiovascular disease and bettercoping skills during hardships and times of stress.  According to research having a positive outlook enables you to cope better with stressful situations, which reduce the harmful health effects of stress on your body.