Zoomers who want to live to a ripe old age, should plan to drink more coffee. A new study suggests that people who drink at least a cup a day have a lower risk of liver cancer compared with those who only indulge occasionally. The study, which was presented Wednesday at the annual meeting of the American Association of Cancer Researchers in San Diego, started in the 1990s, with researchers asking nearly 180,000 adults of different racial and ethnic backgrounds about their coffee drinking and other lifestyle habits. Study participants have now been tracked for as long as 18 years, and researchers have kept tabs on how many have developed hepatocellular carcinoma, the most common kind of liver cancer. So far, 498 study participants have been diagnosed. People who said they drank one to three cups of coffee a day had a 29 percent reduced risk of liver cancer compared with those who drank six cups or less each week. And more was apparently better: People who regularly had more than four cups of coffee a day had a 42 percent reduced risk. To put that in perspective; at the moment, one in 81 men and one in 196 women will get liver cancer over the course of their lives. A 29 percent risk reduction lowers the odds of that diagnosis to one in 104 for men and one in 253 for women.