correlational
Analysis v1
Strong Support
Smoking might make it less likely for Japanese women to have gut bacteria that turn soy into a helpful compound called equol.
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0
Evidence from Studies
Supporting (1)
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Community contributions welcome
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Levels of urinary isoflavones and lignan polyphenols in Japanese women
Cross-Sectional Study
Human
2013 SepThe study found that Japanese women who smoke are much less likely to produce a beneficial compound called equol from soy, which matches exactly what the claim says.
Contradicting (0)
0
Community contributions welcome
No contradicting evidence found
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.