Coffee and tea don't raise breast cancer risk
NEW YORK (Reuters Health) - Results from a decades-long study may enable women to drink coffee or tea without worry that doing so will increase their risk for breast cancer, study findings suggest.
"In this large cohort of women, with 22 years of follow-up, we observed no association between coffee (caffeinated or decaffeinated) and tea consumption and the risk of breast cancer," Dr. Davaasambuu Ganmaa told Reuters Health.
"Coffee and tea are remarkably safe beverages when used in moderation," said Ganmaa, of the Harvard School of Public Health in Boston, Massachusetts.
Ganmaa and colleagues assessed coffee, tea, and caffeine consumption among 85,987 women who participated in the Nurses' Health Study. The women were between 30 and 55 years old at the start of the study.
Over 22 years of follow up, 5,272 women developed breast cancer.
After accounting for other factors potentially associated with breast cancer risk, such as age, smoking status, body mass, physical activity, alcohol intake, family history, menopausal status, history of hormone therapy, and number of children, the researchers found no elevated risk of breast cancer among women who reported drinking 4 or more cups of caffeinated or decaffeinated coffee or tea per day, compared with those who drank less than 1 cup daily.
They also found no apparent association between the occurrence of breast cancer and intakes of other caffeinated soft drinks and chocolate, which contribute to overall caffeine intake.
When the researchers further assessed breast cancer risk specifically among postmenopausal women, they found a modestly reduced risk associated with the highest versus the lowest caffeine intake. But, "this relation needs to be examined further," the investigators note.
International Journal of Cancer, May 2008
What breastcancer.org says about this article…
Coffee and tea don't raise breast cancer risk
The very large study reviewed here found that caffeinated drinks and foods such as coffee, tea, soft drinks, and chocolate didn't increase breast cancer risk among nearly 86,000 women followed for more than 22 years. The researchers also found no link between breast cancer risk and decaffeinated coffee and tea.
Because coffee, tea, and soft drinks are very popular, these results are probably reassuring to many women. It's important to remember that the study only looked at breast cancer risk. Consuming large amounts of caffeine is associated with several health problems, including acid reflux, hypertension, and insomnia.
These results come from an important long-term study called the Nurses' Health Study. In this study, the researchers followed the personal health histories of many people over a very long period of time. This type of research can help doctors make associations between diet, lifestyle, and health factors and the risk of health problems and diseases such as breast cancer. The large number of people in the study and the long period of time they were followed make the results very credible.
While your caffeine intake doesn't seem to affect your risk of breast cancer, there are a number of diet, exercise, and lifestyle choices that can lower your risk. Learn more in the Breastcancer.org Lower Your Risk section.
