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the claim

Long-distance running causes low iron levels in runners.

the verdict
INSUFFICIENT LEANING
Recorded sources
2 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 long-distance running causes low iron levels in runners?

Unclear. One small cross-sectional study of 20 professional middle- and long-distance runners reports significantly lower serum iron than in amateurs, with iron negatively correlated with training level; a clinical reference list also cites studies on iron deficiency in distance runners but states no findings. Neither source establishes that running causes low iron levels.

Verdict: PARTIAL LEAN · 2 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 2
Comprehensive Sports Medicine Treatment of an Athlete Who Runs Cross-Country and is Iron Deficient -
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Comprehensive Sports Medicine Treatment of an Athlete Who Runs Cross-Country and is Iron Deficient - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://pmc.ncbi.nlm.nih.gov/articles/PMC2953317/

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More for · 1
Effects of different exercise levels on serum trace element concentrations.
2025
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Y, X., L, Z., F, F., & J, Y. (2025). Effects of different exercise levels on serum trace element concentrations.. doi.org. https://doi.org/10.1038/s41598-025-21528-y

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