slimvictor
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Drinking more than 28 cups of coffee a week may be harmful for people younger than 55, according to a study.
The debate over coffee's health risks continues to brew. A new study, out Thursday, finds that heavy coffee consumption is associated with a higher death risk in men and women younger than 55.
In the study published online in the journal Mayo Clinic Proceedings, men younger than 55 who drank more than 28 cups of coffee a week (four cups a day) were 56% more likely to have died from any cause. Women in that age range had a twofold greater risk of dying than other women. The study looked at 43,727 men and women ages 20-87 from 1971 to 2002.
"From our study, it seems safe to drink one to three cups of coffee a day," says the study's second co-author Xuemei Sui. "Drinking more than four cups of coffee a day may endanger health," says Sui, assistant professor of exercise science with the Arnold School of Public Health at the University of South Carolina in Columbia. She defines a cup of coffee as 6 to 8 ounces.
The study did not find a higher death risk for adults 55 and older. Sui says there may be a bias — the research may not include unhealthy older people because they might have already died.
The reasons for the higher death risk among younger adults are not clear since experts through the years have found both health benefits and problems associated with coffee.
Sui says the caffeine in coffee can elevate heart rate as well as raise blood pressure and blood sugar levels. However, coffee is a major source of antioxidants, she says.
Sui says the study didn't find a significant association between coffee consumption and heart disease death. Further research is needed to look at any connection between coffee and cancer, she says.
Gregg Fonarow, co-chief of clinical cardiology at the David Geffen School of Medicine at UCLA, says, "Differences in other dietary factors, marital status and other socioeconomic factors that were not adjusted for in this study may account for some or all of these observations."
cont at
http://www.usatoday.com/story/news/nation/2013/08/15/coffee-consumption-death-risk/2655855/