One year post assisted weight maintenance and visit After the final study visit post-maintenance (week 48), participants will continue to be provided either NNS or water beverages for a 12-month duration. They will be asked to return their empty beverage packaging monthly during this phase (weeks 52, 56, 60, 64, 68, 72, 76, 80, 84, 88, 92, 96) and will complete retrospective appetite questionnaires alongside additional questionnaires upon returning their packaging. They will also complete daily online beverage logs online over the duration of the 12-month period and will complete a final online 3-day food diary which they present at Visit 39 (week 100). Participants in Subset 1 will additionally undergo a final set of probe days in weeks 98-99 (Visits 38a, 38b, and 38c). Subset 2 will also provide their final DXA scan at the one year post assisted weight maintenance period visit (Visit 39). At this final visit participants will be asked to provide a fasting blood sample as well as complete a range of computer tasks, questionnaires and food diaries. Their body weight will be measured and their waist, hip and sagittal diameter will be taken in a separate room along with their blood pressure