For many years, people have debated whether drinking alcohol can be good for health.
Some studies have suggested that a glass of wine with dinner might help protect the heart, while other research has warned about links between alcohol and cancer.
A major new study from the Institute for Health Metrics and Evaluation (IHME) at the University of Washington provides one of the most detailed analyses yet and paints a complex picture of alcohol’s effects on the human body.
The findings, published in Nature Health, show that alcohol is associated with an increased risk of several types of cancer even at low levels of consumption.
At the same time, the researchers found mixed evidence for certain heart, metabolic, and brain-related conditions. However, as alcohol intake increases, the risks generally become greater across almost all health outcomes studied.
Alcohol is one of the most widely used substances in the world. Millions of people drink regularly, often believing that moderate consumption is relatively harmless.
Public health experts have struggled for years to provide clear guidance because different studies have produced different results. Some research has suggested benefits for certain diseases, while other studies have highlighted serious risks.
To better understand the evidence, researchers analyzed data from 843 cohort and case-control studies published through 2023.
The team used a special statistical method called the Burden of Proof framework, which was designed to provide conservative estimates and avoid overstating either benefits or harms. This approach allowed the researchers to evaluate alcohol’s relationship with a wide range of diseases and rank the strength of evidence for each one.
One of the clearest findings involved cancer. The researchers found that alcohol use was linked to all ten cancers examined in the study. Importantly, risk increased as alcohol consumption increased.
Even people who drank less than one standard drink per day showed a higher risk for several cancers, including cancers of the throat, colon and rectum, esophagus, breast, liver, pancreas, and prostate.
Some of the strongest evidence involved cancers of the pharynx, a part of the throat. The analysis suggested that alcohol consumption was associated with a risk increase of more than 100 percent for this cancer type. Other cancers, including colorectal, laryngeal, and oral cancers, also showed substantial increases in risk.
The study also found strong evidence linking alcohol to chronic liver disease and cirrhosis. The liver is responsible for processing alcohol, and repeated exposure can cause damage over time.
Alcohol use was associated with at least a 40 percent higher risk of chronic liver disease. The researchers also found increased risks of pancreatitis, a painful condition involving inflammation of the pancreas.
The picture became more complicated when researchers examined cardiovascular and neurological diseases. For some conditions, low-to-moderate drinking appeared to be associated with slightly lower risk compared with complete abstinence.
This pattern is sometimes described as a J-shaped or U-shaped relationship because risk appears lower at moderate levels but rises again at higher levels.
For example, the study found small reductions in risk for type 2 diabetes and dementia-related conditions such as Alzheimer’s disease. However, these associations were relatively weak compared with the strong and consistent cancer findings. Furthermore, any apparent benefits disappeared as alcohol consumption increased.
For heart-related conditions such as ischemic heart disease and stroke, the evidence was mixed. Some studies suggested modest benefits at low levels of drinking, while others did not. At higher levels of consumption, risks increased consistently.
The researchers also found evidence that alcohol increases the risk of atrial fibrillation, a common heart rhythm disorder.
The findings have important implications because drinking guidelines differ greatly between countries.
Some nations recommend very low alcohol limits, while others allow much higher levels. The study found no clear evidence that alcohol affects men and women differently enough to justify substantially different risk thresholds across all health outcomes.
Researchers emphasize that their results should not be interpreted as encouraging alcohol use. While some conditions showed possible benefits at low levels of consumption, cancer risks increased even at relatively low levels.
Public awareness of alcohol’s connection to cancers such as breast and colorectal cancer remains surprisingly low, despite growing scientific evidence.
An analysis of the study suggests that one of its greatest strengths is its enormous scale, combining evidence from more than 800 studies. The conservative statistical approach also helps reduce the risk of overstating findings. However, because much of the evidence comes from observational studies, it cannot prove cause and effect with absolute certainty.
Even so, the overall pattern is clear: alcohol’s health effects are not universally beneficial, and cancer risks appear to increase at any level of consumption. The study provides strong support for public health efforts to better educate people about alcohol-related cancer risks and to encourage informed decisions about drinking.
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