A new analysis of 15 controlled studies has found that a woman’s BMI has a relational effect on her fertility, with obesity associated with significantly worse pregnancy outcomes compared with women with a normal BMI.
It has long been believed that a woman’s general health can and does affect her ability to conceive, and to carry the baby to full-term, but past studies have been inconclusive in showing a direct link between obesity and infertility. However, according to this meta-analysis, obesity puts a mother-to-be at greater risk for adverse pregnancy outcomes when she conceives through in vitro fertilization.
Of the eight studies that reported clinical pregnancy rates among women undergoing assisted reproduction, 40.5 percent of obese women achieved pregnancy, compared with 43.8 percent of women of normal weight. Six studies reported live births, and those two were lower among obese women — the live birth rate was 23 percent among obese women and 25 percent among normal weight controls. Miscarriages occurred in 21.9 percent of obese women compared with 19.3 percent of normal controls.