This randomized control trial is part of a larger EU funded Horizon 2020 project and will assess effectiveness of a new toolkit of mobile health tools designed to help participants who have lost weight to maintain their weight loss. The toolkit includes wireless tracking technologies, Wi-Fi scales and activity sensors, online tools and smart phone apps, multi-media resources and internet-based support.

The NoHoW trial will be conducted in three centers across Europe: The University of Derby, Region H in Copenhagen, and the University of Lisbon.

The study will compare the effectiveness of components of a mobile health toolkit designed for weight loss maintenance in overweight and obese individuals. Participants will be randomly assigned to one of four groups. The three intervention groups will involve mobile health tools to: 1) monitor weight and self-manage eating and activity behaviors, 2) monitor weight and manage emotional responses to stress, 3) monitor weight, self-manage eating and activity behaviors and manage emotional responses to stress. The control group will involve monitoring weight alone.

A total of 1600 men and women aged over 18 years will be recruited at 3 centers (one center in the UK, one in Denmark and one in Portugal). Participants must have a BMI of ≥25 prior to initial weight loss and have lost ≥ than 5% of their weight in the last six months. Measurements of weight, routine health biomarkers, physical activity (activity meter), diet (24 hour recalls), psychological measures and cost effectiveness will be carried out at study entry, 6, 12 and 18 months. The aim is to retain 1002 participants across the 3 centers by 18 months. This means recruiting an initial 533 participants at each center to retain 334 at each center by month 18.

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