Lonely hearts get sicker
Social isolation, C-reactive protein, and coronary heart disease mortality among community-dwelling adults
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
People with very few friends or social ties were much more likely to die of heart disease 15 years later—even if they weren’t overweight, didn’t smoke, and had normal blood pressure.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
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Max 72Case-Control Studies
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Evidence Score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
People with very few friends or social ties were much more likely to die of heart disease 15 years later—even if they weren’t overweight, didn’t smoke, and had normal blood pressure.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 558 / 72
Evidence Score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Publication
Authors
Heffner KL, Waring ME, Roberts MB, Eaton CB, Gramling R
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Claims (6)
Prolonged social isolation is associated with sustained activation of inflammatory pathways that contribute to gradual deterioration of heart tissue and function.
Middle-aged adults with fewer social connections are more likely to have higher levels of a blood marker called C-reactive protein, which indicates systemic inflammation, even when accounting for age, body weight, and income.
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, sex, and traditional cardiovascular risk factors.
People with higher levels of C-reactive protein in their blood have a 2.22 times greater chance of dying from coronary heart disease over 15 years, even after accounting for social isolation. This suggests that C-reactive protein predicts mortality risk on its own, but it does not explain why social isolation is linked to heart disease death.
People who experience social isolation have the same levels of diabetes, body weight, physical activity, and calculated heart disease risk as those who are socially connected, suggesting that social isolation affects heart disease death rates through different biological mechanisms than these known risk factors.