Like a healthy diet, exercise, and good genes, generosity may increase your life span. A 2003 research study at the University of Michigan reveals that the positive effects of generosity include improving one’s mental and physical health and promoting longevity. In another Michigan study, which traced 2,700 people over 10 years, researchers found that men who did regular volunteer work had death rates 2.5 times lower than men who didn’t. Generosity can help reduce stress, support one’s physical health and enhance one’s sense of purpose.