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Moderate coffee drinking is safe, and three to four cups a day may have some health benefits, according to a large review of studies, in the BMJ.
It found a lower risk of liver disease and some cancers in coffee drinkers, and a lower risk of dying from stroke – but researchers could not prove coffee was the cause.
Too much coffee during pregnancy could be harmful, the review confirmed.
Experts said people should not start drinking coffee for health reasons.
The University of Southampton researchers collected data on the impact of coffee on all aspects of the human body, taking into account more than 200 studies – most of which were observational.
