Cancer risk based on alcohol consumption levels: a comprehensive systematic review and meta-analysis.
Level 2 - randomized trial
Systematic review and meta-analysis of prospective cohort studies
PubMed 37905315 · doi:10.4178/epih.e2023092
What was done
A systematic review and meta-analysis evaluating associations between alcohol consumption levels (light, light-to-moderate, heavy) and site-specific and all-cause cancer risks. The authors identified 139 prospective cohort studies and included 106 in the quantitative meta-analysis.
What was found
Light alcohol consumption was not statistically significantly associated with all-cause cancer risk (relative risk, 1.02; 95% confidence interval, 0.99 to 1.04), but showed a dose-response relationship. By site, light consumption was significantly associated with higher risks of esophageal, colorectal, and breast cancers. Light-to-moderate drinking was associated with elevated risks of esophageal, colorectal, laryngeal, and breast cancers. Heavy drinking was associated with risks of stomach, liver, pancreas, and prostate cancers. Females generally had lower cancer risks than males. Specific effect sizes and confidence intervals for individual cancer sites were not reported in the abstract.
Why it matters
This large synthesis shows that cancer risks are not confined to heavy drinking and that even light drinking increases the risk of several common cancers, suggesting there is no risk-free threshold for alcohol consumption.
Limits
All included data are observational, making findings susceptible to residual confounding (such as concurrent smoking or diet) and self-report exposure misclassification. The abstract does not provide specific intake thresholds (in grams/day) for consumption categories, absolute risk estimates, or between-study heterogeneity metrics.
Cited by
- supports Moderate alcohol consumption increases cancer risk and disrupts sleep architecture and the gut microbiome.