Methods/Design: The original protocol was published in Trials (http://www.trialsjournal.com/content/14/1/339 webcite). This update reports on an additional exclusion criterion and change in first eligibility screening to provide greater clarity. The new exclusion criterion “surgical or medical intervention to treat obesity has been added to the original protocol. The risks of developing diabetes will be affected by any medical or surgical intervention as its impact on obesity will alter the outcomes being assessed by MAGDA-DPP. The screening procedures have also been updated to reflect the current recruitment operation. The first eligibility screening is now taking place either during or after pregnancy, depending on recruitment strategy.