The specific purpose of this study is to provide a comprehensive assessment of the burden and costs of operative and non-operative obesity care to develop a set of economic assessment tools that will allow health policy experts, purchasers and payers of healthcare, clinicians and patients to determine the utility and cost-effectiveness of available treatment strategies for managing obesity. Utility refers to qualitative components affected by clinical conditions such as individual's perceptions of quality of life, ability to take care of one-self, or ability to work/be productive. We anticipate that utility changes greatly for people who are able to achieve weight loss, but the differences or degree to which operative and non-operative weight loss treatments affects utility is not well known.