Washington: Women with a lean body shape have a greater risk of developing endometriosis than women who are morbidly obese, a new study has revealed.The study found that the risk of endometriosis was 39 percent lower in morbidly obese women - those with a body mass index (BMI) greater than 40 kg/m2 - compared with women with a current BMI in the low normal range (18.5-22.4 kg/m2).When the researchers looked back at the women`s BMIs when they were 18, they found that women who were morbidly obese at that point in their lives had a 41 percent lower risk of developing endometriosis than women with low normal BMI.The association was strongest in the group of women who were infertile - those who had been trying to become pregnant for more than a year: there was a significantly lower rate of endometriosis (62 percent) among the currently morbidly obese compared with those with a low normal BMI, while it was 77 percent lower among women who were morbidly obese at age 18 compared with those with a low normal BMI at 18.The authors of the study stress that although their findings establish firm evidence of a link between endometriosis and BMI, it does not show that low BMI causes endometriosis. "It is important to note that despite the strength of the evidence underlying the association between body weight and endometriosis, inferences regarding causation or the pathophysiologic process underlying these relations cannot be made," they said.
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