One theory that seeks to explain the link between marriage and health is the act of self-selection.
Simply put, people who are wealthier and healthier than average are more likely not only to get married but also to find a partner who is wealthier and healthier than average. Men and women with poorer health and wealth than average are less likely to marry at all.
While this may be part of the story, marriage also provides partners with a sense of belonging, more opportunities for social engagement and reduced feelings of loneliness.
This social integration, or the extent to which people participate in social relationships and activities, can greatly influence health – from reducing the risk of hypertension and heart disease to lowering one’s risk of death or suicide.