Our objectives were : 1 ) To pilot test a new 12-wk lifestyle intervention using a randomized trial design in obese Latino adolescents , in order to determine the effects of the mind-body modality of Interactive Guided ImagerySM ( IGI ) , over and above those of a didactic lifestyle education , on insulin resistance , eating and physical activity behaviors , stress and stress biomarkers ; and 2 ) To explore the role of intervention-related changes in stress and stress biomarkers on changes in metabolic outcomes , particularly insulin resistance .