No substance has quite the impact on American life that alcohol does. It's there when we celebrate a big achievement with a bottle of champagne. It's there when you spend an evening with friends over a glass of wine. It's at sports events and backyard parties.
It’s also understood that alcohol comes with some health risks, but those risks have become much clearer recently. A major new study, originally intended to inform the latest round of Dietary Guidelines for Americans, was published earlier this summer. It revealed some startling findings.
In this conversation, one of the study’s co-authors, Christopher Kahler, explains the risks of moderate drinking and offers advice on how to minimize those risks. Kahler, who is a professor of behavioral and social sciences and of psychiatry and human behavior at Brown, is also director of the Center for Alcohol and Addiction Studies in the School of Public Health.
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Is it fair to conclude from the new study that the risk of death increases with the number of drinks consumed each week?
Kahler: At seven drinks a week, we found that the risk of having an alcohol-attributable death was one in 1,000. So if you drink at that level in your lifetime, when you die, there's a one-in-1,000 chance that it's a death that we could attribute to alcohol use.
After seven drinks a week, the risk starts to increase. So, at just nine drinks, one-in-100 deaths are due to alcohol. At 14 drinks a week, or just two drinks a day, you’re up to one-in-25.
How did this study come about?
I was part of a research team, and the goal was to look at all the conditions that we know have a causal relationship with alcohol use, drawing on a variety of different forms of evidence.
So the risks of certain things are quite low at four, five or six drinks a week, but by 14 drinks a week, some of those risks have become quite significant. The increased risk of cancer, the increased risk of liver disease, the increased risk of injury; all of those things are beginning to add up.
And it could be any kind of injury, that includes violence as well. Both victimization and perpetration of violence, at different levels of drinking, have a pretty clear dose-response relationship. These risks are associated with higher levels of drinking. When drinking is, say, four or five drinks in a given day, we know the risks of suicide, interpersonal violence and car accidents are greatly increased.
And when each condition has this dose-response relationship, as you start adding up all of those potential things that could happen, that's where the overall risk begins to accumulate.