The guideline recommends that women with a BMI 30 kg/m2 or greater wishing to become pregnant should be advised to take 5mg folic acid supplementation daily, starting at least 1 month before conception and continuing during the first trimester of pregnancy.
Obese women are at high risk of vitamin D deficiency. However, although vitamin D supplementation may ensure that women are vitamin D replete, the evidence on whether routine vitamin D should be given to improve maternal and offspring outcomes remains uncertain.