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A Norwegian study has found that alcohol consumption is associated with advanced colorectal lesions, even at moderate levels. The researchers also suggest that changes in gut bacteria may partly explain this link.

Heavy lifetime alcohol use significantly increases the risk of colorectal cancer, especially rectal cancer, according to a major U.S. screening trial. Consistent heavy drinking across adulthood was linked to a 91% higher risk, while former drinkers showed no elevated risk—suggesting that quitting alcohol may help reduce long-term cancer risk.