The study builds on previous research that shows that aging adults live longer if they have more social connections.

Specifically, the team found that the sheer size of a person's social network was important for health in early and late adulthood.

In adolescence, that is, social isolation increased risk of inflammation by the same amount as physical inactivity while social integration protected against abdominal obesity.

In old age, social isolation was actually more harmful to health than diabetes on developing and controlling hypertension.

In middle adulthood, it was not the number of social connections that mattered, but what those connections provided in terms of social support or strain, the study said.

For the study, the researchers drew on data from four nationally representative surveys of the US population that, together, covered the lifespan from adolescence to old age.

The study was published in the journal Proceedings of the National Academy of Sciences.


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