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Insulin resistance appears to be central to these changes and may also be involved in increased energy accumulation by the fetus. Maternal obesity is associated with many risks to the pregnancy, with increased risk of miscarriage (three\u2010fold) and operative delivery (20.7 versus 33.8% in the obese and 47.4% in the morbidly obese group). Other risks to the mother include an increased risk of pre\u2010eclampsia (3.9 versus 13.5% in the obese group) and thromboembolism (0.05 versus 0.12% in the obese group). There are risks to the fetus with increased perinatal mortality (1.4 per 1000 versus 5.7 per 1000 in the obese group) and macrosomia (&gt;90th centile; 9 versus 17.5% in the obese group). Maternal obesity is associated with an increased risk of obesity in the long term. Obese woman should try to lose weight before pregnancy but probably not during pregnancy. There is no real evidence base for the management of maternal obesity but some practical suggestions are made.<\/jats:p>","DOI":"10.1111\/j.1471-0528.2006.00991.x","type":"journal-article","created":{"date-parts":[[2006,8,10]],"date-time":"2006-08-10T12:40:05Z","timestamp":1155213605000},"page":"1117-1125","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":234,"title":["Review article: Obesity in pregnancy"],"prefix":"10.1111","volume":"113","author":[{"given":"CKH","family":"Yu","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"TG","family":"Teoh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S","family":"Robinson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2006,8,10]]},"reference":[{"key":"e_1_2_10_2_2","unstructured":"Department of Health London. 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