Objective To evaluate the effects of dietary and lifestyle interventions in pregnancy on maternal and
fetal weight and to quantify the effects of these interventions on obstetric outcomes.
Design Systematic review and meta-analysis.
Data sources Major databases from inception to January 2012 without language restrictions.
Study selection Randomised controlled trials that evaluated any dietary or lifestyle interventions with
potential to influence maternal weight during pregnancy and outcomes of pregnancy.
Data synthesis Results summarized as relative risks for dichotomous data and mean differences for
continuous data.