Being isolated from others isn’t just lonely — it may increase your chances of an early death.
Social interactions play an important role in health. In fact, studies have found that a lack of social connections can increase the risk of death by at least 50%, and in some circumstances, by more than 90%.
That’s similar to the risk caused by smoking, and higher than that from obesity or lack of exercise.
But we still don’t know exactly how social isolation affects the body, when the effects occur, and how long they last.
Tracking social relationships and health
In a new study, scientists looked at four studies that tracked thousands of people from adolescence to old age, to determine how social interactions impacted health.
The aim was “to examine how social relationships ‘get under the skin’ to affect physiological well-being as individuals age,” the researchers wrote in the study, which was published Monday in the journal Proceedings of the National Academy of Sciences.
To measure how socially connected a person was, researchers asked people about the structure and quantity of their relationships, which they referred to as “social integration,” as well as the quality of their relationships, as measured by the amount of “social support” (e.g. how well your friends or family understand and care about you) or “social strain” (e.g. how much they criticize you or get you down).
The studies also took several physical measurements, including levels of C-reactive protein — a marker of inflammation — blood pressure, waist circumference, and body mass index.
The researchers compared these social and physical measures at several stages of people’s lives, including adolescence, young adulthood, middle adulthood, and late adulthood.
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