Having a few more cups of coffee and running that extra mile each day can reduce a man's risk of dying of prostate cancer, two studies indicate.

The case for coffee and physical activity as prostate cancer preventatives is far from proven, according to the research reported Tuesday at an American Association for Cancer Research meeting in Houston. But data from the Health Professionals Follow-Up Study show a clear association with both daily activities.

"I wouldn't recommend that people change their coffee-drinking habits based on this study," said Kathryn M. Wilson, a research fellow in epidemiology at the Harvard School of Public Health, and lead author of one report. "But if you like coffee, there is no compelling reason to cut back at this point."

Her data on the nearly 50,000 men in the study showed how common a diagnosis of prostate cancer has become since widespread screening began. In the 20 years from 1986 to 2006, 4,975 cases of prostate cancer were diagnosed, affecting just about 10 percent of the men in the study.

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