Optimism Linked to Improved Survival With Coronary Artery Disease, University of Pennsylvania Study

ABC News -- Can a smile a day keep your heart feeling okay? Some researchers say it might. A new study released Monday adds to growing evidence that having a positive attitude can help you live longer. Researchers looked at nearly 3,000 patients who underwent hospital treatment for heart disease and found that those who had the highest expectations of a full recovery had a higher chance of living longer than those who were pessimistic about their chance of recovery.