By Maxwell Awumah
Ho, June 3 (GNA) – A new study by the Institute for Health Metrics and Evaluation (IHME) at the University of Washington has provided the most comprehensive and conservative analysis to date on the relationship between alcohol consumption and 20 major health outcomes.
The study, Health Effects Associated with Alcohol Consumption: A Burden of Proof Study, published in Nature Health, confirms that alcohol’s impact on health is not uniform.
While risks increase steadily with consumption for some conditions—particularly cancers—low-to-moderate drinking has been associated with lower risks for certain cardiometabolic and neurological conditions in observational studies. However, at higher levels of consumption, alcohol is linked to increased risk across all outcomes examined.
The research applied IHME’s Burden of Proof (BoP) meta-analytic framework to 843 cohort and case-control studies published through 2023, according to a release shared with the Ghana News Agency. The framework accounts for variations across studies and focuses on the most conservative estimates supported by available data. Each alcohol-health outcome relationship was assigned a zero- to five-star rating to indicate the strength and consistency of the evidence.
The study found harmful associations between alcohol consumption and all 10 cancers examined, with risks rising progressively as intake increased. Even consumption below one standard drink per day—less than 10 grams of pure alcohol—was associated with elevated risks of cancers of the pharynx, colorectum, esophagus, breast, liver, pancreas, and prostate.
Pharyngeal cancer (excluding nasopharyngeal cancer) showed at least a 105 per cent increase in risk at average consumption levels. Cancers of the larynx, colorectum, and lip and oral cavity showed moderate evidence of harm, with risk increases ranging from at least 22 per cent to 49 per cent.
Alcohol consumption was also linked to a higher risk of cirrhosis and other chronic liver diseases, with at least a 40 per cent increase in risk, as well as pancreatitis, which showed at least a 22 per cent increase. Evidence was weaker but still suggested elevated risks for lower respiratory infections and tuberculosis.
Esophageal, breast, liver, pancreatic, and prostate cancers demonstrated weaker but consistent evidence of harm, with risks increasing as alcohol consumption rose. Among all cancers studied, stomach cancer was identified as the condition requiring additional evidence to better understand the strength of its association with alcohol use.
The study found a more complex relationship between alcohol consumption and cardiovascular, metabolic, and neurological conditions. For several non-cancer outcomes, the dose-response relationship followed a J- or U-shaped pattern, meaning risks varied across different levels of drinking.
In some cases, low-to-moderate alcohol consumption was associated with lower risks compared with abstinence, while higher levels of drinking were linked to increased risks.
“The science on alcohol and health is genuinely complex,” said Dr. Emmanuela Gakidou, senior author of the study and Professor in the Department of Health Metrics Sciences at IHME.
“For cancer, the evidence is consistent and unambiguous: risk rises with any level of alcohol intake. For some cardiometabolic and dementia outcomes, studies suggest small reductions in risk at low-to-moderate consumption, but those associations weaken and reverse at higher levels of drinking. Rather than interpreting these results as an endorsement of drinking, they provide a clearer picture of where the evidence is strong, weak, or mixed.”
The analysis found small reductions in risk for Type 2 diabetes and Alzheimer’s disease and other dementias—at least 4.5 per cent and 6.4 per cent, respectively. For ischemic heart disease, ischemic stroke, and hemorrhagic stroke, evidence of lower risk at low-to-moderate consumption was inconsistent, while risks increased at higher levels of drinking.
Atrial fibrillation and flutter were associated with increased risk, with the analysis indicating at least a six per cent rise.
Dr. Xiaochen Dai, lead author and research collaborator at IHME, said the framework was designed to provide cautious and transparent estimates.
“Our framework accounts for differences across studies and reports on the smallest plausible effect supported by the data,” Dr. Dai said.
“For some cardiometabolic and dementia outcomes, the relationship is more complex and the evidence is weaker, which is exactly what our star ratings are designed to make clear.”
The findings have important implications for public health policies and alcohol consumption guidelines.
National and international drinking guidelines vary considerably, with lower-risk thresholds ranging from approximately eight to 42 grams of alcohol per day for women and 10 to 52 grams per day for men. The study found no systematic differences in alcohol-health relationships between men and women, suggesting that sex-specific thresholds may not fully reflect the available evidence.
The authors recommend that drinking guidelines be informed by the latest evidence across the full spectrum of health outcomes, discourage heavy episodic drinking, and clearly communicate that even low-to-moderate alcohol consumption is associated with elevated risks for several conditions, particularly cancers.
The study also highlighted that public awareness of alcohol’s link to cancer remains relatively low, especially for cancers such as breast and colorectal cancer, which are less commonly associated with alcohol consumption in public discourse.
The researchers emphasized the need for effective public health communication to help individuals better understand the potential health consequences of alcohol use and make informed decisions about drinking.
GNA
Edited by: Audrey Dekalu
Reporter: Maxwell Awumah