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the claim

High body mass index is a risk factor for rheumatoid arthritis.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
3 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that high body mass index is a risk factor for rheumatoid arthritis?

Yes. Multiple robust epidemiological studies, Mendelian randomization analyses, and systematic reviews indicate that elevated body mass index, overweight, and obesity are significant risk factors for the development of rheumatoid arthritis.

Verdict: SUPPORTED · 3 sources for, 0 against · Last checked

The analysis

The retrieved literature contains robust meta-analytic evidence, Mendelian randomization studies, and large-scale cross-sectional analyses showing a clear positive association between high body mass index and the development of rheumatoid arthritis. No papers contradict this relationship.

Evidence for · 3
The impact of education inequality on rheumatoid arthritis risk is mediated by smoking and body mass index: mendelian randomization study
2021
A Mendelian randomization study found that body mass index acts as a significant mediator accounting for 17% of the causal pathway from socioeconomic factors to rheumatoid arthritis risk.
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Zhao, S. S., Holmes, M. V., Zheng, J., Sanderson, E., & Carter, A. R. (2021). The impact of education inequality on rheumatoid arthritis risk is mediated by smoking and body mass index: mendelian randomization study. doi.org. https://doi.org/10.1101/2021.04.20.21254536

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More for · 2
Association of body mass index with the risk of rheumatoid arthritis: a systematic review and meta-analysis
2026
A systematic review and meta-analysis of observational studies demonstrated that both overweight and obesity are significantly associated with an increased risk of developing rheumatoid arthritis.
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Cao, F., Kang, X., Wang, W., & Huang, S. (2026). Association of body mass index with the risk of rheumatoid arthritis: a systematic review and meta-analysis. doi.org. https://doi.org/10.3389/fmed.2025.1750640

Association between body mass index and rheumatoid arthritis: Exploring a possible role for alkaline phosphatase.
2026
A multivariate analysis of U.S. adults found a positive linear association between higher body mass index and the risk of rheumatoid arthritis.
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W, W. & J, X. (2026). Association between body mass index and rheumatoid arthritis: Exploring a possible role for alkaline phosphatase.. doi.org. https://doi.org/10.1097/md.0000000000049174

What does the evidence say?

The retrieved literature contains robust meta-analytic evidence, Mendelian randomization studies, and large-scale cross-sectional analyses showing a clear positive association between high body mass index and the development of rheumatoid arthritis. No papers contradict this relationship.

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