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Background  Compelling evidence suggests that excessive alcohol consumption increases the risk of atrial fibrillation ( AF ), but the effect of light‐moderate alcohol consumption is less certain. We investigated the association between alcohol consumption within recommended limits and  AF  risk in a light‐drinking population.    Methods and Results  Among 47 002 participants with information on alcohol consumption in a population‐based cohort study in Norway, conducted from October 2006 to June 2008, 1697 validated  AF  diagnoses were registered during the 8 years of follow‐up. We used Cox proportional hazard models with fractional polynomials to analyze the association between alcohol intake and  AF . Population attributable risk for drinking within the recommended limit (ie, at most 1 drink per day for women and 2 drinks per day for men without risky drinking) compared with nondrinking was also calculated. The average alcohol intake was 3.8±4.8 g/d. The adjusted hazard ratio for  AF  was 1.38 (95% confidence interval, 1.06–1.80) when we compared participants consuming >7 drinks per week with abstainers. When we modeled the quantity of alcohol intake as a continuous variable, the risk increased in a curvilinear manner. It was higher with heavier alcohol intake, but there was virtually no association at <1 drink per day for women and <2 drinks per day for men in the absence of risky drinking. The population attributable risk among nonrisky drinkers was 0.07% (95% confidence interval, −0.01% to 0.13%).    Conclusions  Although alcohol consumption was associated with a curvilinearly increasing risk of  AF  in general, the attributable risk of alcohol consumption within recommended limits among participants without binge or problem drinking was negligible in this population.

Does Moderate Drinking Increase the Risk of Atrial Fibrillation? The Norwegian HUNT (Nord‐Trøndelag Health) Study