Large study finds even moderate drinking raises lifetime risks of cancer, disability and premature death

A large study by U.S. and Canadian researchers has found that even moderate alcohol consumption is associated with higher lifetime risks of cancer, heart disease, disability and premature death, challenging the long-held view that low levels of drinking may be broadly safe or beneficial.

The research, published in the Journal of Studies on Alcohol and Drugs and released on November 1 by Columbia University’s Mailman School of Public Health, reviewed more than 7,200 scientific articles and combined that evidence with U.S. health data to estimate alcohol-related harm over a lifetime. The researchers said they found no overall protective effect from drinking at any level once the full range of alcohol-linked diseases and injuries was considered together.

“This study provides the most comprehensive U.S. estimates to date of lifetime risks of alcohol-attributable mortality and morbidity,” Katherine M. Keyes, a professor of epidemiology at Columbia and a co-author of the study, said in material released with the paper. She said the findings showed that “even moderate levels of consumption increase the risk of premature death and disability.”

The lead author, Kevin Shield, an associate professor at the University of Toronto and a senior scientist at the World Health Organization and Pan American Health Organization collaborating center in addiction and mental health, said the results point in the same direction across drinking levels: “Even low levels of alcohol use come with health risks. And that risk continues to increase the more someone drinks.”

The study examined conditions that already have an established causal relationship with alcohol use. Those included cardiovascular disease, liver disease, injuries and several cancers, including cancers of the mouth, esophagus and breast. Rather than focusing on one disease at a time, the researchers tried to estimate alcohol’s total health burden across the life course.

That approach is central to the paper’s main argument. For years, some studies and public discussion have suggested that moderate drinking might help protect against certain cardiovascular problems. The new analysis said that may still appear true for some specific outcomes, such as ischemic heart disease and stroke, at relatively low levels of consumption. But when those possible benefits were weighed against the risks of cancer, liver disease and other alcohol-related harms, the balance moved in the opposite direction.

The researchers reported that even people consuming seven alcoholic drinks a week did not show an overall health benefit once all relevant conditions were included. They also said that drinking above one alcoholic beverage a day was associated with increased health risks for both men and women.

One of the findings likely to draw the most attention concerns consumption levels that many Americans may consider moderate. According to the researchers, two drinks a day was linked to a substantially higher lifetime risk of premature death attributable to alcohol. The journal reference for the paper states that mortality increased to 1 in 25 at 14 drinks per week.

The study also highlighted the practical difficulty of defining “one drink.” In general, a standard drink is about 12 ounces of beer, 5 ounces of wine or 1.5 ounces of distilled spirits, though the actual alcohol content can vary by product. That means the amount of alcohol people consume may be higher than they assume, especially with stronger beers, larger pours of wine or mixed drinks served outside the home.

The findings arrive as federal guidance on alcohol remains less specific than in past years. The current U.S. Dietary Guidelines for Americans advise adults who drink to limit alcoholic beverages, but they do not set a clear daily level that can be consumed without added risk. Earlier guidance had said men should have no more than two drinks a day and women no more than one.

The authors said their analysis was intended in part to provide clearer estimates for that policy discussion. In an editorial published with the study, Robert M. Vincent, a former associate administrator at the U.S. Substance Abuse and Mental Health Services Administration, wrote that the research had been commissioned to help inform alcohol guidance in the 2025-2030 Dietary Guidelines process but that its findings were not given proper weight.

That part of the debate is likely to matter beyond public health agencies. If federal officials, medical groups or advocacy organizations move toward more specific advice that emphasizes risk at low levels of consumption, it could affect how beer, wine and spirits are marketed, labeled and discussed in consumer health messaging. It may also influence how restaurants, retailers and producers respond to rising scrutiny around moderate drinking claims.

The study’s authors said the analysis does not predict exactly what will happen to any one person who drinks. Individual outcomes can differ based on genetics, age, sex, underlying health, diet, exercise, smoking, medication use and patterns of drinking, including binge drinking. The estimates describe average risks across populations, not a certain outcome for a specific individual.

They also acknowledged limits in the available evidence. The models were built from what they described as the best available data, but science on alcohol and long-term disease continues to evolve. The authors noted that some possible alcohol-related harms, including pancreatic cancer, still need further study to clarify the strength of the connection and the amount of alcohol involved.

Still, the paper adds to a growing body of research that questions the idea that moderate drinking improves overall health. Instead of supporting a safe threshold, the authors said the evidence points to increasing harm as alcohol consumption rises, with no net benefit at low levels once all major causes of alcohol-related illness and death are considered together.

The work was funded by Synergy Enterprises Inc. and the U.S. Substance Abuse and Mental Health Services Administration. The paper’s author list included researchers from institutions in the United States, Canada and elsewhere, reflecting a broad review effort aimed at estimating alcohol’s effect over an American lifetime.