The investigators have adopted a single-arm intervention pilot study to assess the potential effects of a nutrition/physical activity behavioural intervention in women with a history of GDM within the past 5 years. The investigators have designed the intervention to include in-person sessions- but at a feasible frequency for busy mothers- as well as telephone calls and an on-line discussion forum, to provide an ongoing source of support, information, and accountability. Further, participants' partners will be invited to some of the in-person sessions and childcare will be provided on-site. Importantly, there are no meal replacements included, despite the study title, because focus group discussions indicated that this was not of interest to the target population.