Researchers examined the role of marital status in the development of type 2 diabetes. Using prospective data from the Health Professionals Follow-up Study, researchers found that unmarried men (especially widowers) had an elevated risk of developing type 2 diabetes, when compared to married men (adjusting for other factors). This increased risk may be partially mediated by unfavorable changes in lifestyle, diet, and adiposity.
While low levels of negative emotion or high levels of cardiorespiratory fitness are predictors of long-term survival in men and women, being both fit and not unhappy provides a strong combined effect, reducing premature death by 63 percent, according to this study.