Spanish researchers have reported that the lining of the uterus, or the endometrium, may be a significant factor in explaining some obese women's infertility, according to Reuters.
Typically, women suffering from obesity tend to have trouble conceiving, and research from the University of Valencia has shown that this could be from the excess weight acting on the ovaries and endometrium, increasing the chance of miscarriage and ectopic pregnancy.
Scientists looked at 2,656 women undergoing infertility treatment and found that as the body mass index (BMI) increased, the level of pregnancy success decreased.
Particularly, women with a BMI of above 25 were only 38.3 per cent likely to carry an embryo beyond 20 weeks per cycle of treatment.
Dr Jose Bellver, head of the study, wrote in the report: "The role of the endometrium or its environment seems to be small, but should be taken into account."
He added that the correction of excess weight "could improve the reproductive outcome in overweight and obese patients".
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