The Claim

Social isolation is associated with increased coronary heart disease mortality, with the strongest association observed at the lowest level of social integration, while no significant difference in risk is observed between moderate and high levels of social integration, indicating a nonlinear relationship where only severe isolation is linked to elevated mortality risk.

Source: Social isolation, C-reactive protein, and coronary heart disease mortality among community-dwelling adults

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
58score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Correlation
1 study reviewed
In plain English

People who are severely socially isolated have a higher risk of dying from coronary heart disease compared to those with moderate or high levels of social connection; however, there is no meaningful difference in risk between those with moderate and high levels of social connection.

See the scientific wording

The association between social isolation and coronary heart disease mortality was strongest at the lowest level of social integration, with no significant difference in risk between moderate and high levels of social integration, suggesting a nonlinear relationship where only severe isolation confers elevated risk.

Why this might work

When someone is extremely lonely for a long time, their body stays in a state of high stress, which causes more inflammation and messes up the nerves that control the heart. This makes the heart work harder and damages blood vessels over time, increasing the chance of a fatal heart event.

Supported mechanismbased on 1 study

What the research says

1 study

  1. Study: Social isolation, C-reactive protein, and coronary heart disease mortality among community-dwelling adults

    People who are very lonely have a much higher chance of dying from heart disease than those who are somewhat or very connected to others — but being somewhat connected isn’t much riskier than being very connected. Only extreme loneliness seems to be dangerous.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

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