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(JAMA 2017;318(18):1765–1766)In the United States, approximately half of all pregnant women were overweight or obese in 2014, which increases the risk of maternal and fetal complications. Obesity may contribute to the recent increase in maternal mortality in the US, but the cause of this relationship is unknown. It is not clear if mortality is caused by comorbid events in obese women or if the care of obese women is more difficult to manage. Since severe maternal morbidity in obese women may contribute to and precede mortality, studying the associations between obesity and severe maternal morbidity in pregnancy may shed additional light on this connection.