BOSTON Observational research has suggested that light alcohol consumption may provide heart-related health benefits, but in a large study published in JAMA Network Open, alcohol intake at all levels was linked with higher risks of cardiovascular disease. The findings, which are published by a team led by researchers at Massachusetts General Hospital (MGH) and the Broad Institute of MIT and Harvard, suggest that the supposed benefits of alcohol consumption may actually be attributed to other lifestyle factors that are common among light to moderate drinkers.
The study included 371,463 adultswith an average age of 57 years and an average alcohol consumption of 9.2 drinks per weekwho were participants in the UK Biobank, a large-scale biomedical database and research resource containing in-depth genetic and health information. Consistent with earlier studies, investigators found that light to moderate drinkers had the lowest heart disease risk, followed by people who abstained from drinking. People who drank heavily had the highest risk. However, the team also found that light to moderate drinkers tended to have healthier lifestyles than abstainerssuch as more physical activity and vegetable intake, and less smoking. Taking just a few lifestyle factors into account significantly lowered any benefit associated with alcohol consumption.
The study also applied the latest techniques in a method called Mendelian randomization, which uses genetic variants to determine whether an observed link between an exposure and an outcome is consistent with a causal effectin this case, whether light alcohol consumption causes a person to be protected against cardiovascular disease. Newer and more advanced techniques in non-linear Mendelian randomization now permit the use of human genetic data to evaluate the direction and magnitude of disease risk associated with different levels of an exposure, says senior author Krishna G. Aragam, MD, MS, a cardiologist at MGH and an associate scientist at the Broad Institute. We therefore leveraged these new techniques and expansive genetic and phenotypic data from biobank populations to better understand the association between habitual alcohol intake and cardiovascular disease.
When the scientists conducted such genetic analyses of samples taken from participants, they found that individuals with genetic variants that predicted higher alcohol consumption were indeed more likely to consume greater amounts of alcohol, and more likely to have hypertension and coronary artery disease. The analyses also revealed substantial differences in cardiovascular risk across the spectrum of alcohol consumption among both men and women, with minimal increases in risk when going from zero to seven drinks per week, much higher risk increases when progressing from seven to 14 drinks per week, and especially high risk when consuming 21 or more drinks per week. Notably, the findings suggest a rise in cardiovascular risk even at levels deemed low risk by national guidelines from the U.S. Department of Agriculture (i.e. below two drinks per day for men and one drink per day for women).
The discovery that the relationship between alcohol intake and cardiovascular risk is not a linear one but rather an exponential one was supported by an additional analysis of data on 30,716 participants in the Mass General Brigham Biobank. Therefore, while cutting back on consumption can benefit even people who drink one alcoholic beverage per day, the health gains of cutting back may be more substantial and, perhaps, more clinically meaningful in those who consume more.
The findings affirm that alcohol intake should not be recommended to improve cardiovascular health; rather, that reducing alcohol intake will likely reduce cardiovascular risk in all individuals, albeit to different extents based on ones current level of consumption, says Aragam.
The studys lead author was Kiran J. Biddinger, and additional authors included Connor A. Emdin, MD, DPhil, Mary E. Haas, PhD, Minxian Wang, PhD, George Hindy, MD, Patrick T. Ellinor, MD, PhD, Sekar Kathiresan, MD, and Amit V. Khera, MD, MSc.
Funding was provided by the National Institutes of Health and the American Heart Association.
About the Massachusetts General HospitalMassachusetts General Hospital, founded in 1811, is the original and largest teaching hospital of Harvard Medical School. The Mass General Research Instituteconducts the largest hospital-based research program in the nation, with annual research operations of more than $1 billion and comprises more than 9,500 researchers working across more than 30 institutes, centers and departments. In August 2021, Mass General was named #5 in theU.S. News & World Reportlist of "Americas Best Hospitals."
JAMA Network Open
Data/statistical analysis
People
Association of Habitual Alcohol Intake With Risk of Cardiovascular Disease
25-Mar-2022
Dr Haas reported receiving personal fees and stock and stock options from Regeneron Pharmaceuticals outside the submitted work. Dr Ellinor reported receiving grants from Bayer AG and IBM Health and personal fees from Bayer AG, MyoKardia, Quest Diagnostics, and Novartis during the conduct of the study. Dr Kathiresan reported being an employee of Verve Therapeutics; owning equity in Verve Therapeutics, Maze Therapeutics, Color Health, and Medgenome; receiving personal fees from Medgenome and Color Health; serving on the advisory boards for Regeneron Genetics Center and Corvidia Therapeutics; and consulting for Acceleron, Eli Lilly and Co, Novartis, Merck, Novo Nordisk, Novo Ventures, Ionis, Alnylam, Aegerion, Haug Partners, Noble Insights, Leerink Partners, Bayer Healthcare, Illumina, Color Genomics, MedGenome, Quest Diagnostics, and Medscape outside the submitted work. Dr Khera reported receiving personal fees from Merck, Amarin Pharmaceuticals, Amgen, Maze Therapeutics, Navitor Pharmaceuticals, Sarepta Therapeutics, Verve Therapeutics, Silence Therapeutics, Veritas International, Color Health, and Third Rock Ventures and receiving grants from IBM Research outside the submitted work. Dr Aragam reported receiving speaking fees from the Novartis Institute for Biomedical Research. No other disclosures were reported.
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Large study challenges the theory that light alcohol consumption benefits heart health - EurekAlert
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