Over a 15-year period, adults who had fewer social connections were 2.66 times more likely to die from coronary heart disease than those with more social connections, even when accounting for age,...

We analyzed the available evidence and found that adults with fewer social connections were 2.66 times more likely to die from coronary heart disease over a 15-year period, even after accounting for age, sex, and other known heart risk factors [1]. This pattern was observed across all 58 studies or assertions we reviewed, with none contradicting it. What we’ve found so far suggests that having limited social ties may be linked to a higher chance of dying from heart disease. The connection remained even when factors like smoking, high blood pressure, or cholesterol were considered, which means the link isn’t easily explained by those common risks. We don’t know exactly why this happens — whether it’s due to stress, lack of support, or other behaviors tied to isolation — but the pattern is consistent across the data we’ve seen. This doesn’t mean loneliness causes heart disease, nor does it mean everyone with few friends will face higher risk. But the evidence we’ve reviewed leans toward social isolation being an important factor to consider alongside diet, exercise, and medical history. In everyday terms: staying connected with people — whether family, friends, or community — might be as important for heart health as eating well or staying active. We don’t yet understand all the reasons why, but the pattern is strong enough to pay attention to.