Overweight Women Undertaking ART Twice as Likely to Miscarry as Their Slimmer Counterparts, Study Finds

Another reason to dissuade the fat from having kids.

Being overweight leads to a greater risk of miscarriage for patients undergoing assisted reproductive technology (ART), according to a study presented at the 26th annual conference of the European Society of Human Reproduction and Embryology.

"Although there is evidence that miscarriage rates are higher in overweight women who conceive spontaneously, there were conflicting views about the effect of increased weight on the outcome of pregnancies occurring after IVF and ICSI," Dr. Rittenberg said. "The difficulty of interpreting the studies to date is that they are heterogeneous, their thresholds for defining obesity vary, and they assess the outcome in relation to BMI following the transfer of multiple embryos at various stages of development. Our study differs in that we transferred only one embryo at a specific stage of development, and were therefore able to provide clear evidence of the deleterious effect of being overweight on the chances of miscarriage."

Being overweight can lead to a number of other pregnancy risks including high blood pressure, pre-eclampsia, diabetes, premature delivery and post-partum bleeding. Besides the inherent medical dangers of these conditions, they can lead to lengthy hospital stays for the pregnant woman. Additionally, babies of obese mothers are more likely to have a high birth weight and thus may face an increased rate of delivery by Caesarean section, which in itself can cause complications for both mother and baby.

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