A Daily Brew Tied to Lower Liver Risk
Regular coffee consumption—caffeinated or decaffeinated—is linked to a lower risk of serious liver disease. A study published in Clinical Gastroenterology and Hepatology tracked 354,957 participants for about 13 years, finding that coffee drinkers experienced lower rates of cirrhosis, liver cancer, and liver-related mortality.
Data from the UK Biobank
Researchers analyzed data from the UK Biobank participants who joined between 2006 and 2010, following participants aged 40 to 69 who were initially free of cirrhosis or liver cancer. Hyunseok Kim, a transplant hepatologist at Cedars-Sinai Medical Center and the study’s lead author, noted the protective signal remained consistent across the cohort.
Compared to non-coffee drinkers, those consuming five or more cups daily saw:
- A 32 percent lower risk of cirrhosis.
- A 47 percent lower risk of liver cancer.
- A 42 percent lower risk of liver-related death.
Using MRI scans for nearly 30,000 participants and blood protein analysis for 44,000 others, researchers observed that higher coffee intake correlated with lower levels of liver fat, reduced liver iron, and lower odds of elevated cT1, an MRI marker linked to liver inflammation.
The Role of Antioxidants and Polyphenols
The study observed a dose-related benefit, yet protective effects were not limited to high-volume drinkers; reductions in risk were noted among those consuming one to four cups per day. Pichamol Jirapinyo, an assistant professor of medicine at Harvard Medical School and spokesperson for the American Gastroenterological Association, suggests the benefits likely stem from antioxidants and polyphenols rather than caffeine alone.
These compounds may reduce oxidative stress and chronic inflammation, both of which contribute to liver injury. Experimental studies suggest these components may also decrease fat accumulation in the liver, reduce the activation of scar-forming cells, and limit the development of fibrosis.
Limitations of Observational Findings
While significant, the findings are observational, identifying associations rather than direct causation. Because coffee intake was self-reported, other lifestyle factors could influence results despite statistical adjustments. Kim emphasizes that coffee is no substitute for the fundamentals. “Coffee should complement, not replace, the fundamentals—avoiding excessive alcohol, maintaining a healthy weight, exercising, and managing diabetes, cholesterol, and blood pressure,” he says.
Balancing Benefits and Side Effects
For those who tolerate coffee, experts suggest a range of one to four cups daily. Jirapinyo warns that “more isn’t necessarily better,” as excessive consumption can lead to side effects including insomnia, anxiety, heart palpitations, or stomach pain. Caution is advised for those who are pregnant, have heart arrhythmias, or suffer from severe reflux or caffeine sensitivity.
Regarding additives, the study found benefits even among those using sugar or artificial sweeteners. However, Kim notes that additives were linked to “modestly higher” MRI markers for liver inflammation. He recommends opting for unsweetened coffee, particularly for individuals managing metabolic risk factors like obesity or diabetes.