RecruitingProcedureChange of Adipose Tissues and Triglyceride After Bariatric Surgery or Life-style InterventionThe study is aimed * To quantify the change of adipose tissues, triglyceride in liver and pancreas and cholesterol after lifestyle intervention or bariatric surgery. * To test the hypothesis that Brown fat is an independent biomarker for the development of Non Alcoholic Fat Liver Disease (NAFLD) * To study the association among Brown fat, NAFLD and obesity.