The intervention is based on the concept of Acceptance and Commitment Therapy (ACT) and is conducted by specially trained physiotherapist and a dietician. The intervention in SDOI has the predominantly focus on each individual reflection and realization and is built upon ACT' six core processes. Specific focus on teach participant with different narrative and background and on coaching and back-and-forth dialogue with physiotherapist and dietician. The program is based on up to 13 times attendance within the 12 months intervention period. Part 1: Three to five individual coaching, Part 2: six group sessions and Part 3: one or two individual coaching.

Compliance to the intervention is classified as 'good' if the participants participate for a minimum four out of six group sessions, a minimum three out of five initial individual coaching and a minimum one out of two individual coaching post intervention.

The reference group will not receive the intervention in the study and only participate in the test/data collection. The reference group will established consisting of participants participating in the SDOI program but, who of some reasons have refused participating in the lifestyle program. In case of insufficient recruitment of participants to the reference group, individuals meeting inclusion criteria such as age and BMI will be recruited via advertising in local newspapers and social media.

The intervention in SDOI has the predominantly focus on each individual reflection and realisation and is built upon ACT' six core processes: 1) Acceptance, 2) Cognitive defusion 3) Being present, 4) Self as context, 5) Values, and 6) Committed action.

The program is based on up to 13 times attendance within the 12 months intervention period.

Measured by the questionnaire Impact of Weight on Quality of Life-Lite at week 52. Scores range from 0 to 100, with 100 representing the best quality of life.

Measured by Accelerometer

Questionnaire