Daily coffee consumption halves the risk of a form of liver cancer, and the greater the consumption the greater the protection.
Some studies have suggested a relationship between coffee consumption and a decreased risk of hepatocellular carcinoma (HCC), a type of liver cancer.
Manami Inoue of the National Cancer Center in Tokyo and colleagues have now investigated the relationship using a 10-year public health study, the Japan Public Health Center-Based Prospective Study.
The researchers looked at coffee use in people diagnosed with liver cancer and people without the disease.
They found that those who drank coffee daily or almost daily had about half the risk of liver cancer compared with those who never drank coffee.