This study is an experiment of putting social sciences to work in developing a support intervention for healthy lifestyle changes that would be attractive and manageable in real-life settings. Starting with a hypothesis that a class of intervention methods based on an unconventional 'low-tension' strategy may offer an effective support of stable, long-term changes well integrated in everyday life, difficult to maintain with conventional dieting and self-control approaches, this study focuses on designing and optimizing an intervention model combining several low-tension methods: mindfulness, small steps and group support.