Tuesday, March 11, 2014
Just 2 weekly units may make a difference; middle class women most likely to drink more than this
Drinking alcohol during the first three months of pregnancy may heighten the risk of having a premature or unexpectedly small baby, suggests research published online in the Journal of Epidemiology and Community Health.
In the UK the Department of Health recommends that pregnant women and those trying to conceive should not drink alcohol at all and no more than 1-2 units a week.
Middle class women were most likely to drink more than this, the study found.
The researchers base their findings on responses to food frequency questionnaires by 1264 women at low risk of birth complications in Leeds. All the women were part of the Caffeine and Reproductive Health (CARE) study, looking into links between diet and birth outcomes.
The mums to be were asked how often they drank alcohol, and what type it was, at four time points: in the four weeks before conception; and in each of the subsequent three months (trimesters) throughout the pregnancy.
Alcohol consumption was significantly higher before conception and in the first three months of pregnancy than in the subsequent two trimesters, averaging 11, 4, and just under two units a week, respectively.
Over half (53%) of the women drank more than the recommended maximum two weekly units during the first trimester. And almost four out of 10 said they drank more than 10 units a week in the period leading up to conception.
Those who drank more than two units a week were more likely to be older, educated to degree level, of white ethnicity, and more likely to live in affluent areas.
Some 13% of the babies born were underweight, and 4.4% were smaller than would be expected; a similar proportion (4.3%) were born prematurely.
Drinking during the first three months of pregnancy was most strongly linked to these outcomes.
Women who drank more than the recommended two weekly units were twice as likely to give birth to an unexpectedly small or premature baby than women who abstained completely.
But even women who didn't exceed the maximum recommended alcohol intake during this period were still at increased risk of a premature birth, even after taking account of other influential factors.
Drinking during the period leading up to conception was also linked to a higher risk of restricted fetal growth, indicating that this may also be a critical period, suggest the authors.
"Our results highlight the need for endorsing the abstinence-only message, and further illuminate how timing of exposure is important in the association of alcohol with birth outcomes, with the first trimester being the most vulnerable period," they write.
Thursday, March 6, 2014
Exercising during pregnancy reduces excessive weight gain and the possibility of suffering from associated illnesses
These are the results of a study published in the journal Mayo Clinic Proceedings carried out by researchers from the University of Granada, Madrid Polytechnic University and the European University
The exercise plan designed managed to prevent excessive weight gain during pregnancy in 40% of the women studied. The risk of having a baby with macrosomia (inordinate weight of over 4 Kg in newly-born) can be reduced by up to 86% in obese or overweight women if they exercised during the pregnancy
Excessive weight gain during pregnancy increases the risk of suffering illnesses such as hypertension and gestational diabetes, or of having a premature birth or a birth by Caesarean; furthermore, it also has negative effects on the newly-born and increases the risk of infants being overweight by 30%.
Aware of the importance of preventing gestational weight gain, both in mother and child, researchers from the University of Granada, Madrid Polytechnic University and the European University carried out a study on the benefits of exercising during pregnancy to prevent weight gain, entitled “Supervised Exercise – Based Intervention to Prevent Excessive Gestational Weight Gain: A Randomized Controlled Trial”, which has been published in the journal Mayo Clinic Proceedings.
The research, which took place between 2007 and 2011, and in which 962 pregnant women took part, reveals that, in healthy women, moderate-intensity supervised exercise, begun immediately following the first prenatal consultation, avoids excessive weight gain on ending this period and reduces the risk of suffering from associated illnesses, such as gestational diabetes or hypertension.
Furthermore, the study shows that the benefits of exercise are greater in women of normal weight than in those that are overweight or obese, who can also benefit from exercise, but to a lesser extent.
Dr. Rubén Barakat, head researcher of the study and lecturer at the Madrid Polytechnic University, declares that “thanks to the joint work of professionals from the fields of Sports Science and Medicine, we have been able to demonstrate the importance of correct exercising habits, supervised and directed during the pregnancy. In this sense, there is still a lot to do, since we believe that the benefits of programmed physical excercise during pregnancy can even affect the infant’s first years of life. Recent scientific evidence allows us to consider this idea. For this, new studies are needed to research the influence of gestational exercise on maternal, fetal and child parameters; it would be a great mistake not to extend this type of research, using more extensive and ambitious clinical tests. This is only the tip of the iceberg”.
In turn, Dr. Jonatan Ruiz, main author of the article and a Ramón y Cajal researher at the Faculty of Sports Science of the University of Granada, underlines that “the benefits of regular physical activity during pregnancy and the post-natal period are the same well-known benefits that the general population obtain. Pregancy is an ideal time to change habits and to adopt a physically-active lifestyle during this period and for the rest of life”.
The researcher and professor of Exercise Pysiology at the European University, Alejandro Lucía, adds that “in general, the benefits of physical exercise are greatly neglected in current medicine and this type of studies helps to create more knowledge so that doctors will prescribe exercise that is personalized and in accordance with the conditions of each sector of the population”.
Lower weight gain
To carry out this study, the women were randomly divided into two equal groups. The first group, as well as carrying out the usual pregnancy healthcare instructions, took light-to-moderate aerobic exercise 3 times a week in sessions of 50-55 minutes, from weeks 9 to 39 of the pregnancy. The second group followed the usual recommendations for any pregnant woman.
The results of the study show that weight gain in the women who followed the exercise programme was less that in the women that did not; more specifically, the risk of gaining weight in excess of the recommendations of the American Institute of Medicine was 40% lower in the women who followed the regime of physical activity. To analyse the results, the researchers took into account data such as age of the mother, gestational age, studies and weight before pregnancy.
Likewise, even though that, in the case of the obese or overweight women, taking exercise 3 times a week has not been as efficient, there has been an 86% reduction in the risk of having a baby with macrosomia (inordinate weight of over 4 Kg in newly born).
The researchers state that, through this type of studies, “we wish to emphasize the importance of maintaining the health of pregnant women, as well as their children, by reaching an optimum weight; hence the importance of taking physical exercise”.
Pregnant women who eat a "prudent" diet rich in vegetables, fruits, whole grains and who drink water have a significantly reduced risk of preterm delivery, suggests a study published on bmj.com today.
A "traditional" dietary pattern of boiled potatoes, fish and cooked vegetables was also linked to a significantly lower risk.
Although these findings cannot establish causality, they support dietary advice to pregnant women to eat a balanced diet including vegetables, fruit, whole grains, and fish and to drink water.
Preterm delivery (before 37 weeks of pregnancy) is associated with significant short and long term ill-health and accounts for almost 75% of all newborn deaths.
Evidence shows that a mother's dietary habits can directly affect her unborn child, so researchers based in Sweden, Norway and Iceland set out to examine whether a link exists between maternal diet and preterm delivery.
Using data from the Norwegian Mother and Child Cohort Study, they analysed preterm births among 66,000 women between 2002 and 2008.
To be included, participants had to be free of diabetes, have delivered a live single baby, and completed a validated food frequency questionnaire on dietary habits during the first four to five months of pregnancy.
Factors that may have affected the results (known as confounding), including a mother's age, history of preterm delivery and education were taken into account. Preterm delivery was defined as delivery between 22 and <37 weeks of pregnancy.
The researchers identified three distinct dietary patterns, interpreted as "prudent" (vegetables, fruits, oils, water as a beverage, whole grain cereals, poultry, fibre rich bread), "Western" (salty and sweet snacks, white bread, desserts, processed meat products), and "traditional" (potatoes, fish, gravy, cooked vegetables, low fat milk).
Among the 66,000 pregnant women, preterm delivery occurred in 3,505 (5.3%) cases.
After adjusting for several confounding factors, the team found that an overall "prudent" dietary pattern was associated with a significantly reduced risk of preterm delivery, especially among women having their first baby, as well as spontaneous and late preterm delivery.
They also found a significantly reduced risk of preterm delivery for the "traditional" dietary pattern. However, the "Western" dietary pattern was not independently associated with preterm delivery.
This indicates that increasing the intake of foods associated with a prudent dietary pattern is more important than totally excluding processed food, fast food, junk food, and snacks, say the authors.
They stress that a direct (causal) link cannot be drawn from the results, but say the findings suggest that "diet matters for the risk of preterm delivery, which may reassure medical practitioners that the current dietary recommendations are sound but also inspire them to pay more attention to dietary counselling."
These findings are important, as prevention of preterm delivery is of major importance in modern obstetrics. They also indicate that preterm delivery might actually be modified by maternal diet, they conclude.
In an accompanying editorial, Professor Lucilla Poston at King's College London, says healthy eating in pregnancy is always a good idea.
She points to several studies that have proposed the benefit of a diet rich in fruit and/or vegetables in prevention of premature birth, and says health professionals "would therefore be well advised to reinforce the message that pregnant women eat a healthy diet."