The link between relationship status and well-being is a complicated one. Despite plenty of sensational headlines—”Get married and get fat!” “Stay single and die young!”—it’s hard to say definitively whether being a spouse or a singleton (or something in between, as many Americans are today) is healthier overall.
That’s because every relationship and every person is different, says Bella DePaulo, Ph.D., a visiting researcher at the University of California Santa Barbara and author of Singled Out: How Singles Are Stereotyped, Stigmatized, and Ignored, and Still Live Happily Ever After. And because scientists can’t randomly assign study participants to either get married or stay single, it’s impossible to rule out other factors that could be at play.
Still, trends do seem to exist among people in different types of relationships, with potential lessons that all adults—regardless of their marital status—can use to better their quality of life. Here are seven ways flying solo may affect your health, for better or worse.