Alcohol Consumption and Heart Disease Risk

The Link Between Heavy Drinking and Heart Health

Excessive alcohol intake can significantly elevate the risk of heart disease. However, the effects of lower levels of alcohol consumption remain unclear. A recent study conducted in Norway aimed to clarify this relationship.

Study Overview

Heavy drinking is known to markedly increase the chances of developing heart disease. While some studies have indicated that even low to moderate alcohol consumption may adversely affect heart function, the findings have been inconsistent. Researchers from Norway, the USA, and Sweden investigated heart function in a group of healthy Norwegian adults to explore the connection between heart health and alcohol consumption. Their findings were published in the scientific journal BMJ Open.

Participant Details

The study involved 1,179 adults residing in Nord-Trøndelag County, Norway, consisting of 613 women and 566 men, with an average age of 49. All participants were free from cardiovascular disease, diabetes, and high blood pressure. They provided information on the quantity and type of alcoholic beverages they typically consumed, along with details about their lifestyle and socioeconomic status.

Methodology for Measuring Heart Function

Researchers employed echocardiography, a specialized ultrasound imaging technique, to assess heart performance and size, particularly focusing on the left ventricle. This chamber is the largest and most muscular part of the heart, responsible for pumping oxygenated blood throughout the body. The researchers compared the heart measurements to the alcohol consumption reported by participants, adjusting for factors such as age, gender, smoking status, marital status, education, physical activity, and body mass index.

Findings on Alcohol Consumption Patterns

Most participants were light drinkers, averaging fewer than three alcoholic beverages per week. In contrast, the American Office of Disease Prevention and Health Promotion defines moderate alcohol consumption as one or two drinks per day (7 or 14 per week for women and men, respectively). In this study, 16% of participants consumed half a drink or less weekly, 60% had between half and three drinks, and 20% reported consuming three to seven drinks. Only 5% averaged more than seven drinks weekly, and drinkers were more likely to smoke than non-drinkers.

Relationship Between Alcohol Consumption and Heart Structure

Though the study did not find a direct relationship between heart function and alcohol consumption, there was a notable correlation between the estimated mass of the left ventricle and alcohol intake. Participants consuming more alcohol tended to have heavier left ventricles. For instance, those drinking over seven drinks weekly had an average left ventricle mass of 181 grams, compared to 159 grams for those consuming between half a drink and three drinks per week. This trend was consistent across both genders.

Binge Drinking and Heart Health

Some participants reported binge drinking, defined as consuming more than five drinks at one time. These individuals also exhibited heavier left ventricles.

Limitations and Conclusions

The researchers acknowledged several limitations in their study. As an observational study, it could not definitively establish a causal relationship between alcohol consumption and heart changes. Experimental interventions would be required to draw such conclusions. Additionally, the accuracy of alcohol consumption reporting relied on participant self-disclosure.

The study did not find evidence that light to moderate alcohol consumption impaired heart function among the relatively light drinkers in this sample. However, individuals who consumed higher amounts, particularly those engaging in binge drinking, displayed larger left ventricles compared to lighter drinkers. An enlarged heart is typically indicative of stress and may signal potential health issues in the future.

References

(1) Gémes, K., Janszky, I., Strand, L. B., László, K. D., Ahnve, S., Vatten, L. J., Dalen, H. & Mukamal, K. J. Light–moderate alcohol consumption and left ventricular function among healthy, middle-aged adults: the HUNT study. BMJ Open 8 (2018)
(2) U.S. Department of Health and Human Services and U.S. Department of Agriculture. 2015–2020 Dietary Guidelines for Americans. 8th Edition. December 2015. https://health.gov/dietaryguidelines/2015/guidelines/appendix-9/