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Institute of Medicine (IOM) guidelines on gestational weight gain (JW Womens Health Jul 2 2009) have been questioned because they classify obesity into a single category (body-mass index [BMI], ≥30.0 kg/m2) with one range for recommended gestational weight gain (5.0–9.0 kg). In a population-based cohort study of Swedish Medical Birth Registry data from >46,000 obese women categorized as WHO class I (BMI range, 30.0–34.9), II (35.0–39.9), or III (≥40.0), researchers evaluated adverse pregnancy outcomes associated with four IOM categories of gestational weight change (<0.0 kg [loss]; 0.0–4.9 kg [low gain]; 5.0–9.0 kg [recommended gain]; and >9 kg [excessive gain]). Outcomes were preeclampsia, cesarean or operative vaginal delivery, blood loss…