People who smile a lot are usually happier, have more stable personalities, more stable marriages, better cognitive skills and better interpersonal skills, according to research. Science has just uncovered another benefit of a happy face. People who have big smiles live longer.
Researchers at Wayne State University used information from the Baseball Register to look at photos of 230 players who began their careers in professional baseball before 1950. The players' photos were enlarged, and a rating of their smile intensity was made (big smile, no smile, partial smile). The players' smile ratings were compared with data from deaths that occurred from 2006 through 2009. The researchers then corrected their analysis to account for other factors associated with longevity, such as body mass index, career length, career precocity and college attendance.