A new study by Keck Medicine of USC indicates that episodic heavy drinking significantly increases the risk of liver fibrosis, or scarring, in individuals diagnosed with metabolic dysfunction–associated steatotic liver disease (MASLD). Published in Clinical Gastroenterology and Hepatology, the research suggests that the pattern of alcohol consumption, rather than solely the total amount consumed, is a significant factor in liver harm.
Understanding Episodic Heavy Drinking and Its Impact
The study defined episodic heavy drinking as consuming four or more alcoholic drinks in a single day for women, and five or more for men, at least once per month. Key findings include:
- Individuals who engage in episodic heavy drinking were found to be three times more likely to develop advanced liver fibrosis compared to those who distributed the same total alcohol intake over time.
- Younger adults and men reported episodic heavy drinking more frequently.
- A direct correlation was observed between the number of drinks consumed at one time and an increased tendency for liver fibrosis.
- Over half of the adults included in the study reported engaging in episodic heavy drinking.
- Approximately 16% of MASLD patients in the study were identified as episodic heavy drinkers.
Brian P. Lee, MD, MAS, a hepatologist and liver transplant specialist with Keck Medicine and the study's principal investigator, noted that medical professionals have traditionally assessed liver risk based primarily on total alcohol consumption. The research suggests implications for public awareness regarding the potential dangers of occasional heavy drinking, even if overall alcohol intake is considered moderate.
Study Details and Methodology
Researchers utilized data from over 8,000 adults collected between 2017 and 2023 from the National Health and Nutrition Examination Survey (NHANES). The study focused on MASLD, a common liver condition affecting approximately one in three adults in the U.S., often linked to excess weight, obesity, or metabolic conditions such as Type 2 diabetes, high blood pressure, and high cholesterol.
The team compared MASLD patients with similar age, sex, and average weekly alcohol consumption, distinguishing between episodic heavy drinkers and non-episodic heavy drinkers. The research examined the link between episodic heavy drinking and advanced liver fibrosis, including its influence on liver damage in moderate drinkers, defined as up to seven drinks weekly for women and 14 for men.
Implications and Potential Mechanisms
Dr. Lee speculates that consuming large quantities of alcohol in a short period may overwhelm the liver's processing capacity, potentially leading to increased inflammation and scarring. Individuals with MASLD may face elevated risk due to co-existing conditions such as obesity and high blood pressure, which previous research indicates can exacerbate liver disease risk.
Reports indicate that alcohol-related liver disease has more than doubled in the past two decades. Dr. Lee attributes this trend to factors including increased drinking during the COVID-19 pandemic and a rise in MASLD risk factors. While this study concentrated on MASLD patients, the findings may hold relevance for a broader population, suggesting a need for further consideration by medical professionals and researchers.