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Urine of Pregnant Women Could Predict Fetal Growth and Birth Weight

by Julia Samuel on November 4, 2016 at 10:41 PM
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Urine of Pregnant Women Could Predict Fetal Growth and Birth Weight

Abnormal fetal growth and birth weight are well-established risk factors for chronic diseases later in life, including the development of type-2 diabetes and obesity.

The urine of pregnant women could be used to help identify lifestyle interventions that help maintain a healthy birth weight for their baby, according to new research published in BMC Medicine.

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Dr Mireille Toledano, co-lead author of the research from the School of Public Health at Imperial College London, said: "We used a technique called NMR spectroscopy to identify, for the first time, a panel of 10 urinary metabolites in the 3rd trimester of pregnancy that were associated with greater fetal growth and increased birth weight. These metabolites included steroid hormones and important biological building blocks called branched-chain amino acids (BCAAs)."

BCAAs are essential nutrients that are vital during pregnancy as an energy source for the growing fetus. In this study, changes in BCAAs and other metabolites detected in the urine were able to explain 12% of the variation seen in birth weight, independent of other known predictors such as parent's own weight and maternal smoking or alcohol intake.
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Dr Muireann Coen, co-lead author from the Department of Surgery and Cancer at Imperial College London, added: "We found that a 50% increase in the mother's level of individual BCAAs equated to a 1-2.4% increase in birth weight, or 5-11 grams.

When we made comparisons with the lifestyle and environmental exposures of the women in our study we found that the variability between BCAA profiles of individual mothers could be partially explained by levels of physical activity, vitamin D, coffee consumption and smoking exposure, suggesting them to be potential areas of intervention to promote a healthy birth weight."

Although the researchers found an association between several lifestyle factors and the metabolomic signature detected in the mother's urine, it is not clear from this study if one is the cause of the other, or if any specific lifestyle factor is associated with an individual metabolite.

In observational studies like this it is not possible to rule out other factors and an experimental trial would be needed to test cause and effect. This proof-of principle study highlights the value metabolic profiling of pregnant women could have on personalizing pregnancy plans to improve fetal growth outcomes.

Source: Medindia
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