The Claim

Genetically predicted diabetes liability mediates 41% (95% CI: 18% to 63%) of the increased coronary artery disease risk associated with higher BMI, and among all tested mediators, it is the strongest single mediator, while genetically predicted fasting glucose in non-diabetics does not significantly mediate this relationship.

Source: Risk factors mediating the effect of body-mass index and waist-to-hip ratio on cardiovascular outcomes: Mendelian randomization analysis

What the research says

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How it works
1 study reviewed
In plain English

Genetic factors that increase diabetes risk explain 41% of why higher body mass index is linked to greater coronary artery disease risk, and this is the strongest single genetic pathway identified; genetic variation in fasting glucose among people without diabetes does not significantly explain this link.

See the scientific wording

Diabetes liability, as genetically predicted, mediates 41% (95% CI: 18% to 63%) of the increased coronary artery disease risk from higher BMI, making it the strongest single mediator identified, while genetically predicted fasting glucose in non-diabetics shows no significant mediation effect.

Why this might work

When a person has a genetic tendency to develop diabetes, their body produces more insulin resistance and chronic high blood sugar, which damages blood vessel lining and triggers inflammation in the arteries. This damage builds up over time and causes blockages in the heart arteries. Higher body weight worsens this process, but normal blood sugar levels in people without diabetes do not cause the same damage.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: Risk factors mediating the effect of body-mass index and waist-to-hip ratio on cardiovascular outcomes: Mendelian randomization analysis

    This study found that about 4 in 10 of the heart disease risk from being overweight comes from a genetic tendency to get diabetes, but normal blood sugar levels in people without diabetes don’t add much to that risk.

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

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