Does drinking less alcohol noticeably lower your cancer risk?

Drinking less or no alcohol noticeably reduces your cancer risk. Alongside smoking and excess weight, alcohol is one of the three largest avoidable causes of cancer. The association has been demonstrated strongly and consistently across multiple large studies, and is considered probably causal.

The scale is substantial. In the United States in 2014, alcohol was responsible for 5.6% of all new cancer diagnoses and 4.0% of all cancer deaths, amounting to tens of thousands of cases per year¹. In terms of impact, that makes drinking less comparable to quitting smoking.

For breast cancer, research suggests a lower risk following alcohol cessation, broken down by tumour type². The direction is positive, but this is a single study, so the precise size of the effect has not yet been firmly established. For pancreatic cancer, alcohol acts by increasing the risk of chronic pancreatitis, which in turn raises the likelihood of pancreatic cancer³. Drinking less helps, but quitting smoking has the greatest effect here.

The idea that moderate wine drinking is good for your heart deserves a caveat. Observational research shows an association with fewer cardiovascular diseases compared with beer or spirits⁴, but such studies are susceptible to lifestyle differences and other differences between groups. The actual protective effect of alcohol itself is therefore uncertain. For cancer, in any case, there is no safe lower threshold at which the risk disappears^5,6.

In people who had cancer as a child, a healthy lifestyle with limited alcohol use was associated with a 20 to 30 percent lower risk of long-term mortality⁷. Observational, but the effect is large enough to be taken seriously in a clinical context.