Women And Caffeine - Good And Bad News
Women And Caffeine - Good And Bad News
The study appears in the current online issue of the American Journal of Obstetrics and Gynecology.
The researchers, from California’s Kaiser Permanent Division of Research, said women who consumed 200 mg or more of caffeine per day (about two cups of coffee) doubled their miscarriage risk.
Caffeine sources also included tea, fizzy drinks and hot chocolate.
The study surveyed the caffeine habits of 1063 pregnant women from 1996 to 1998. It controlled pregnancy-related symptoms of nausea, vomiting and caffeine aversion that tended to interfere with the determination of caffeine’s true effect on miscarriage risk.
Author Dr De-Kum Li said the findings showed that pregnant women should consider stopping all caffeine consumption during pregnancy.
"This research provides clearer and stronger evidence that high doses of caffeine intake during pregnancy can increase the risk of miscarriage," Dr Li said.
However, Dr Alan Leviton, professor of neurology at Harvard Medical School who reviewed the study, said: "Of the women participating in this study, 59 per cent of the women classified as having a miscarriage had it before enrolment.
"Thus, this is not a prospective study as claimed by the authors."
Meanwhile a second study suggests women who drink coffee can reduce their risk of developing ovarian cancer.
The findings, reported in the journal Cancer, come from a continuing study of some 121,000 being conducted by Harvard Medical School.
The researchers found no link between alcohol and tobacco and this kind of cancer - but found that caffeine consumption seemed to help, especially if a woman had not used contraceptive pills.
The researchers, led by Dr Shelley Tworoger, write: "The possibility that caffeine may reduce ovarian cancer risk, particularly for women who have not previously used exogenous hormones, is intriguing and warrants further study, including an evaluation of possible biological mechanisms."
American Journal of Obstetrics and Gynecology January 2008; Cancer Online January 22, 2008.
Last Updated: 22/01/2008 - 12:00 AM
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