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Pregnant women or those trying to conceive should consider avoiding caffeine, according to new research. © Other Current advice is for caffeine intake to be limited to 200 milligrams per day
Women in these groups are currently told to have no more than 200 milligrams a day of caffeine.
But the study, by Professor Jack James, of Reykjavik University in Iceland, found that caffeine significantly increased the risk of adverse pregnancy outcomes.
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These include stillbirth, miscarriage and low birth weight.
It also reported an increased risk of childhood acute leukaemia and children being overweight or obese when born to mothers who consume caffeine during pregnancy.
The research, which is published in the journal BMJ Evidence Based Medicine, examined data from 37 observational studies.
Caffeine is naturally in foods and drinks such as tea, coffee, and chocolate but it is also added to some energy drinks, cold and flu medicines and some soft drinks.
Prof James wrote: "Current advice such as that issued by... the NHS is not consistent with the level of threat indicated by biological plausibility of harm and extensive empirical evidence of actual harm.
"Accordingly, current health recommendations concerning caffeine consumption during pregnancy are in need of radical revision.
No amount of coffee safe during pregnancy, scientist warns
Pregnant women or those hoping to conceive should avoid coffee altogether, a scientist has urged. Excessive caffeine consumption during pregnancy has been linked to an increased risk of low birthweight and miscarriages, however, the NHS states 200mg – around two mugs of instant coffee – a day is safe. To better understand the potential dangers, a scientist from Reykjavik University analysed 48 studies carried out in the past 20 years. AlthoughExcessive caffeine consumption during pregnancy has been linked to an increased risk of low birthweight and miscarriages, however, the NHS states 200mg – around two mugs of instant coffee – a day is safe.
"Specifically, the cumulative scientific evidence supports pregnant women and women contemplating pregnancy being advised to avoid caffeine."
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Daghni Rajasingham, consultant obstetrician and spokesperson for the Royal College of Obstetricians and Gynaecologists, said: "The findings of this study add to the large body of evidence that supports limited caffeine intake during pregnancy, but pregnant women do not need to completely cut out caffeine, as this paper suggests.
"The Royal College of Obstetricians and Gynaecologists' advice to limit caffeine intake to 200 milligrams per day - the equivalent to two cups of instant coffee - still stands. This paper does not supersede all the other evidence that has found that a limited intake of caffeine is safe for the majority of pregnancy women."
Dr Mary Ross-Davie, director for Scotland at the Royal College of Midwives, added: "There is a need to ensure that women are able to make informed choices about what they eat and drink during pregnancy, and midwives will support women to do that, taking into account this latest research.
"It is important that all available evidence is considered to shape UK recommendations, and we hope the current guidance will now be reviewed in light of these findings."
Caffeine in pregnancy linked to increased risk of stillbirth .
Researchers say energy drinks appear to carry a higher risk than coffee and cola Researchers said that women should be informed of the risk - particularly if they drink above 300 milligrams a day, or the equivalent of three mugs of instant coffee.