Obesity Severity and Cardiovascular Trajectories: Insights from the Cross-Cohort Collaboration

MedXY Editorial Team•Mar 2, 2026•Cardiology

Severe obesity (Class 3, BMI ≥40 kg/m²) is associated with a 3.0-fold increased risk of heart failure and a 2.8-fold increased risk of atrial fibrillation compared to normal weight.
Women with severe obesity experience higher relative increases in the risk of stroke, total CVD, and all-cause mortality compared to men in the same BMI categories.
While obesity is a robust risk factor for most cardiovascular outcomes, stroke risk in men did not show a linear increase with higher BMI categories, whereas in women, the risk remained significantly elevated but plateaued.
Adjusting for traditional clinical risk factors does not eliminate the increased risk associated with high BMI, suggesting independent pathophysiological mechanisms related to adiposity.

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This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.

Severe obesity (Class 3, BMI ≥40 kg/m²) is associated with a 3.0-fold increased risk of heart failure and a 2.8-fold increased risk of atrial fibrillation compared to normal weight.
Women with severe obesity experience higher relative increases in the risk of stroke, total CVD, and all-cause mortality compared to men in the same BMI categories.
While obesity is a robust risk factor for most cardiovascular outcomes, stroke risk in men did not show a linear increase with higher BMI categories, whereas in women, the risk remained significantly elevated but plateaued.
Adjusting for traditional clinical risk factors does not eliminate the increased risk associated with high BMI, suggesting independent pathophysiological mechanisms related to adiposity.