Loneliness is no fun — and now it appears it's bad for you as well. UCLA researchers report that chronically lonely people may be at higher risk for certain types of inflammatory disease because their feelings of social isolation trigger the activity of pro-inflammatory immune cells.
In their analysis of 93 older adults, the researchers screened for gene function among different types of immune cells and found that genes originating from two particular cell types — plasmacytoid dendritic cells and monocytes — were overexpressed in chronically lonely individuals, compared with the remainder of the sample. These cell types produce an inflammatory response to tissue damage, and are part of the immune system's first line of defense, which produces an immediate inflammatory response to tissue damage.
It's this same inflammatory response that, over the long-term, can promote cardiovascular disease, cancer and neurodegeneration.