Optimistic older adults who see the glass as half full appear to have a reduced risk of developing heart failure.

Researchers from the University of Michigan and Harvard University found that optimism—an expectation that good things will happen—among people age 50 and older significantly reduced their risk of heart failure. Compared to the least optimistic people in the study, the most optimistic people had a 73-percent reduced risk of heart failure over the follow-up period.

via Optimism associated with lower risk of heart failure.