Five hundred and sixty obese adults ( BMI 30-40 kg/m ( 2 ) ) between 18 and 60 years old will be randomized to one of 16 conditions in a fractional factorial design involving five intervention components : treatment intensity ( 12 vs. 24 coaching calls ) , reports sent to primary care physician ( No vs. Yes ) , text messaging ( No vs. Yes ) , meal replacement recommendations ( No vs. Yes ) , and training of a participant 's self-selected support buddy ( No vs. Yes ) .