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Cohort study
Study raises new doubts regarding the hypothesised health benefits of ‘moderate’ alcohol use
  1. Tim Stockwell1,
  2. Timothy Naimi2
  1. 1University of Victoria, Centre for Addictions Research of British Columbia, Victoria, British Columbia, Canada
  2. 2Boston University Schools of Medicine and Public Health, Boston University, Boston, Massachusetts
  1. Correspondence to : Professor Tim Stockwell, University of Victoria, Centre for Addictions Research of British Columbia, P.O. Box 1700 STN CSC, Victoria, British Columbia, Canada V8W 2Y2; timstock{at}uvic.ca

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Context

Many observational studies find associations between ‘moderate’ alcohol use and reduced mortality risk compared with abstention. Low doses of alcohol have also been associated with improvements in some biomarkers of cardiovascular health in short-term randomised studies. However, the absence of any randomised clinical trial of any morbidity or mortality outcome, and contradictory Mendelian randomisation studies,1 cast doubt on the veracity of associations found in observational studies. Goulden lists alternative explanations for the classic J-shaped curve for alcohol use and mortality risk, including selection bias, misclassification of drinkers as abstainers and residual confounding. We comment here as authors of a meta-analysis2 raising identical concerns and reporting similar findings.

Methods

Goulden examined the relationship between level of average daily alcohol consumption and risk of death from all …

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