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the claim

Drinking black coffee before a fasting blood test can alter the results.

the verdict
CONTESTED PARTIAL
Recorded sources
1 source for · 2 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 drinking black coffee before a fasting blood test can alter the results?

Partly. A clinic reference warns that even black coffee can skew fasting blood work results, while a small preliminary crossover study (n=3) and a 27-volunteer study of coffee before phlebotomy found no clinically significant changes in routine metabolic markers. The evidence covers only part of the picture and points in both directions.

Verdict: CONTESTED PARTIAL · 1 source for, 2 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 · 1
Fasting Before Blood Work
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Fasting Before Blood Work. (n.d.). my.clevelandclinic.org. https://my.clevelandclinic.org/health/articles/fasting-for-blood-work

Evidence against · 2
Effect of Black Coffee on Fasting Metabolic Markers and an Abbreviated Fat Tolerance Test
2020
Get citation
Keirns, B. H., Elliott, D., Sciarrillo, C. M., Koemel, N. A., Poindexter, K. L., & Emerson, S. (2020). Effect of Black Coffee on Fasting Metabolic Markers and an Abbreviated Fat Tolerance Test. doi.org. https://doi.org/10.1093/cdn/nzaa049_032

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More against · 1
Coffee intake one hour prior to phlebotomy produces no clinically significant changes in routine biochemical test results -
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Coffee intake one hour prior to phlebotomy produces no clinically significant changes in routine biochemical test results - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.11613/BM.2023.020705

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