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Additional file 1. Additional methods, data and analyses and full list of CAPTURE study investigators/collaborators.

Objectives: Obesity is a growing issue with increasing impact on healthcare budgets, yet very little is known about weight loss experiences of people with body mass index (BMI)≥30kg/m2 and their willingness to try and pay for weight loss interventions (WLI). The objective of this survey was to gather knowledge about weight loss experiences among obese and severely obese people. Methods: 1,003 Danish people >18 years of age with BMI≥30 who wanted to lose weight completed an online survey. Data included demographics, experience with WLI, awareness of anti-obesity medication (AOM), and willingness to try and pay for WLI including AOM. Results: Respondents had been trying to lose weight for several years (medium [25% percentile;75% percentile]);5.1[2.0;10.3] years (BMI 30-35) and 10.0 [5.0;20.0] (very obese (BMI>35) with co-morbidities (OWC). The desired weight loss was 20.0 [15.0;25.0] kg (BMI 30-35) and 35.0 [28.0;47.5] kg (OWC). Independent of educational level and gender, health concern was the main incentive for weight loss. Several WLI had been tried repeatedly, yet 60% of respondents with BMI 30-35 and 50% of the OWC were unaware of AOM. Among those who had tried AOM, side effects and lack of effectiveness were the main reasons to stop. 50-73% were willing to try AOM dependent on expected weight loss. Willingness to try and pay for new AOM was strongest for the OWC. Conclusion: Respondents had made repeated attempts for up to a decade to lose weight, yet remained far from their ideal weight. They had spent a substantial amount of money on WLI, had limited information of AOM, and indicated a desire for increased professional support.