Taking vitamin supplements during pregnancy does not prevent miscarriages and stillbirths, research reveals
Posted on 20th February 2017 by Anahita Sharma
Anahita’s blog ‘Taking vitamin supplements during pregnancy does not prevent miscarriages and stillbirths, research reveals’ won joint 1st prize in our 2017 Cochrane UK & Ireland Symposium competition. See here for more information about what the entrants were asked to do. Her blog is written in the style of a Guardian news article.
Cochrane analysis demonstrates that regularly popping multivitamins during pregnancy has no impact on total rates of foetal loss
Women are advised that taking multivitamins during pregnancy will not reduce their risk of miscarriage or stillbirth.
Annually, millions of women will embark on a universal, timeless, journey – pregnancy.
Approximately 1 in 4 will experience this journey cut unexpectedly and tragically short by a miscarriage or a stillbirth. Although these are common occurrences, they have been described as events enshrouded by an overwhelming silent and personal grief, with lasting psychological ramifications for both expectant and non-expectant parents.
A miscarriage is defined as a pregnancy that ends prematurely, before 24 weeks from the date of a woman’s last menstrual period. A stillbirth refers to foetuses born without signs of life after 24 weeks of gestation. Whilst stillbirths are recognised and registered under the Births and Deaths Registration Act 1953, miscarriages are not; both are, however, classified as ‘foetal death’ under the definition of the World Heath Organisation (WHO). Regardless of timing, the causes for either are multifold, and parents can often be left searching for answers for a death unwitnessed.
Solutions are actively being researched to identify specific factors that increase or decrease the risk of foetal loss. Presently, women are advised on a host of lifestyle factors, which include stopping smoking and recreational drug use, and achieving good control of medical problems such as diabetes and hypertension, to help reduce this risk.
With respect to nutrition during pregnancy, the use of multivitamins is no new phenomenon. The WHO recommends that pregnant women consume balanced diets – adequate in proteins, carbohydrates, vitamins, and minerals – in order to optimise perinatal maternal and foetal health. In addition to this generic nutritional advice, pregnant women are also advised to take weekly iron and folic acid supplements during pregnancy (daily doses for those who found to be anaemic). For those with a low dietary intake of calcium, calcium supplements are also recommended. Multivitamins are routinely recommended for pregnant women, and are included in the U.K.’s nationwide Healthy Start Scheme.
However, what role does this conventional wisdom play in preventing spontaneous miscarriages and stillbirths?
The Cochrane Collaboration, a body of independent researchers and analysts, and proponent for evidence-based interventions, has examined the existing evidence around the impact that regularly taking nutritional supplements has on foetal loss.
The group combined the results for 278,413 pregnancies in 40 trials which took place in 21 countries. These trialled the use of Vitamin C, Vitamin A, folic acid, antioxidants, multivitamins, and combinations of the aforementioned, during pregnancy. Vitamins were taken either prior to pregnancy, around conception, or during early pregnancy (< 20 weeks).
Their analysis concluded that regularly taking nutritional supplements during these periods does not reduce the risk of miscarriage.
Two of the included studies demonstrated a reduced risk of miscarriage and foetal death when taking multivitamin preparations without folic acid, but as these sampled small numbers of women, the
researchers advised that these results could not be extrapolated.
They did, however, find that taking multivitamins in conjunction with iron and folic acid could reduce the risk of having a stillbirth.
The analysis did not account for the impact of vitamin dosage, or look at outcomes for specific high- risk groups such as the women with pre-existing vitamin deficiencies and pre-existing high-risk conditions for spontaneous miscarriage.
The characteristics of the pregnant women included in the study were heterogeneous. Definitions for stillbirth and miscarriage also varied amongst studies.
All in all, researchers uniformly demonstrated that early foetal death should not be linked to taking or not taking multivitamins, which is an important finding in light of the sense of accountability many parents may experience afterwards.
Should pregnant women currently taking or intending to take multivitamins continue to do so? Although the evidence remains scant on multivitamins preventing miscarriage, their use in contributing to the general health, wellbeing, and growth of mother and child during pregnancy, stands. Pregnant and breastfeeding women have higher nutritional requirements for vitamins and minerals, which can be continue to be met through a combination of nutritional supplements and dietary intake.
Image sources (licensed freely for noncommercial use):
Pregnant mother with umbrella http://www.publicdomainpictures.net/pictures/60000/velka/pregnant-woman-silhouette- clipart-1378847526j4t.jpg
Wall art; miscarriage https://c1.staticflickr.com/5/4116/4805646514_11bbed44b2_b.jpg
Nutritional supplements on table https://pixabay.com/p-623706/?no_redirect
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