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11 September, 2017 | 10:47
Pregnant women who drink up to two standard glasses of wine a week are unlikely to harm their unborn babies, a new study shows.
The evidence that light drinking in pregnancy or occasionally dangerous "surprisingly limited" but scientists are suggesting pregnant women are advised to avoid alcohol "just in case."
This is because there is a small risk of having underweight or premature infants if women drink up to four units a week.
previous research has shown heavy drinking during pregnancy causes birth defects, affect the intelligence of babies and causing motor problems behavioral, mental and well.
As a result, women are told to avoid strenuous or "binge drinking" but advice on the level of drinking "safe" remains a gray area.
until the current UK guidelines advise women to avoid drinking alcohol when trying to conceive, and in the first trimester.
At the same time show that consumption should be limited to withi n "1:59 UK units once or twice a week."
However, the new guidelines of the Head of the UK Department of Health recommended women should not drink alcohol at all while trying to conceive or during pregnancy, on the grounds that it was "better to be safe than sorry."
But this has left many women confused about whether there is the safe limit and if only one glass is dangerous.
problem remains of great public health importance because up to 80 per cent of mothers-to-be in the UK, Ireland, New Zealand and Australia drank alcohol during their pregnancy.
So scientists at Bristol University set out to determine the effects of low to moderate levels of drinking by women in pregnancy and long-term health effects on their children.
Research conducted a systematic review of 5,000 studies and selected 26 that looked at the effects of drinking the light of the two units up to twice a week, or four units a week, equivalent to a total of about 32 g compared with no alcohol at ll.
It looks mainly at the complications of pregnancy and birth characteristics, such as miscarriage, premature birth, and infant-sized and long-term issues, such as developmental delay, impaired intelligence and behavioral difficulties typical fetal alcohol syndrome -. the consequences of heavy drinking in pregnancy
It was found drinking up to four units a week while pregnant, on average, was associated with an eight percent higher risk of having a small baby, compared with not drinking at all.
Likewise, drink up to four units or 32g a week was associated with a 10 percent increased risk of premature birth.
Research noted in comparison, light to moderate smoke less than 20 cigarettes per day was associated with a 22 percent increased risk.
But the evidence on how much, if any, is safe to drink, or what stage of pregnancy, it is important by its absence.
The Senior Research Associate Dr Loubaba Mamluk said: "In conclusion, we fo und limited evidence for the causal role of light drinking in pregnancy, compared with abstention, the majority of results are reviewed.
"Despite the differences between drinking light and never become a point of tension and confusion for health professionals and pregnant women and contribute to the guidance consistent and advice now and in the past, a review showed our extensive that specific question is not being scrutinized closely enough, if at all.
"In addition, there has been no evidence about the possible benefits of alcohol consumption lighter than abstinence.
"Formulating guidelines while challenging the evidence base.
"However, describing the lack of current research and explains that" absence of evidence is not evidence of absence, 'appears justified.
"Women who have had a drink during pregnancy should be reassured that they might not have led to a considerable loss of their baby, but if you're worried, they sho uld discuss this with their doctor or midwife.
"Evidence of the effects of drinking up to 32 g / week in pregnancy is rare.
"Because there is some evidence that even light alcohol consumption prenatal associated with being underweight and premature births, guidance can suggest abstention as the precautionary principle."
175 ml standard glass of red, white or rose wine with ABV of 12 percent contains 2.1 units.
The study is published in the journal BMJ Open.
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