However, doctors warn that these findings aren't enough to advise those who aren't drinking coffee already to pick up the habit.Just that people who are already drinking that much don't necessarily need to stop.
They caution pregnant women and women at high risk of fractures should limit their coffee consumption.
The studies used mainly observational data, providing lower quality evidence, so no firm conclusions could be drawn about cause and effect, but the findings do back up other recent reviews and studies of coffee intake. "There is a balance of risks in life, and the benefits of moderate consumption of coffee seem to outweigh the risks", he added.
And coffee drinkers may have healthier livers and better glucose control than non-coffee drinkers.
At present, the researchers said pinning down exactly how coffee might have a positive impact on health was "difficult". Increasing consumption to above three cups a day was not associated with harm, but the beneficial effect was less pronounced. We found that there was a lower risk of both conditions in people who drank more coffee. The latest study builds on that research but calls for more randomised controlled trials to further understand the correlation.
Coffee drinking during pregnancy islinked withlow birth weight. This included lower risk of death from any causes, or getting heart disease. Should people start drinking coffee for health reasons?
But a year ago the World Health Organisation withdrew its previous warnings on the link between coffee and bladder cancer - and instead said that the drink could, in fact, help protect against certain cancers such as womb cancer and liver cancer.
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