Vivek Murthy, the surgeon general of the United States, has said many times in recent years that the most prevalent health issue in the country is not cancer or heart disease or obesity. It is isolation.
Beginning in the 1980s, Schwartz says, study after study started showing that those who were more socially isolated were much more likely to die during a given period than their socially connected neighbors, even after you corrected for age, gender, and lifestyle choices like exercising and eating right. Loneliness has been linked to an increased risk of cardiovascular disease and stroke and the progression of Alzheimer’s. One study found that it can be as much of a long-term risk factor as smoking.
The research doesn’t get any rosier from there. In 2015, a huge study out of Brigham Young University, using data from 3.5 million people collected over 35 years, found that those who fall into the categories of loneliness, isolation, or even simply living on their own see their risk of premature death rise 26 to 32 percent.