36-week assisted weight maintenance phase. Participants will be asked to attend one hour monthly group sessions with a dietician-trained researcher (10-12 participants per group) during the 36-week assisted weight maintenance phase running from week 13-48. These meetings will provide an opportunity for participants to discuss any concerns and to provide further reminders of nutritional advice. Body weight will be measured at the end of each group session and will be conducted privately with each participant in a separate room. Participants will also be asked to complete a series of questionnaires measuring appetite control and ease of dieting and measures of dietary compliance alongside providing the online daily beverage log and weekly paper exercise log. Participants will also be asked to complete FFQs monthly during this period. At the end of this phase further visits (independent from group sessions) will be scheduled to complete the final measures of appetite and food choice and to provide their final online 3-day diet diary.