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A urinary marker of alcohol intake
Summary
New urine biomarkers for alcohol consumption show higher levels in daily drinkers compared to weekly and non-drinkers. These ethanol markers correlate with drinking frequency but not self-reported intake, suggesting potential racial differences in alcohol metabolism.
Area of Science:
- Biomarkers
- Alcohol Metabolism
- Urine Analysis
Background:
- Previous development of an assay measuring free and conjugated ethanol in urine.
- Confirmed alcoholics showed significantly higher ethanol marker levels than control subjects.
Purpose of the Study:
- To assess the relationship between urinary ethanol biomarkers and self-reported alcohol intake.
- To evaluate the discriminatory power of these biomarkers across different drinking patterns (non, weekly, daily).
- To explore potential racial differences in ethanol elimination rates.
Main Methods:
- Analysis of free, bound, and total ethanol in urine samples from a multiethnic male cohort (n=128, age >35).
- Comparison of biomarker levels across non-drinkers, weekly drinkers, and daily drinkers.
- Stepwise discriminant analysis to determine the best biomarker for discriminating drinking classes.
Main Results:
- Mean levels of all ethanol biomarkers increased significantly with drinking frequency (non < weekly < daily).
- Total ethanol was the most effective biomarker for differentiating drinking classes.
- No correlation was found between biomarker levels and self-reported grams of ethanol consumed daily.
- Significant racial variations in biomarker levels for similar self-reported intake were observed.
Conclusions:
- Urinary ethanol biomarkers effectively reflect drinking frequency but not absolute consumption levels.
- Potential for racial differences in in vivo ethanol elimination rates warrants further investigation in larger cohorts.