Gallup, which started tracking Americans' alcohol habits more than 80 years ago, says the drop in drinking rates coincides with Americans' growing concerns that even moderate drinking is unhealthy.

After years of being told that red wine was good for heart health, more Americans appear to be heeding warnings that even moderate alcohol consumption can be unhealthy.

"Or people curious in decreasing the amount of alcohol they drink." According to Gallup, which has tracked American drinking behavior since 1939, just 54% of adults self-reported using alcohol last year.