Five hundred and sixty obese adults ( BMI @-@ kg/m ( @ ) ) between @ and @ years old will be randomized to one of @ conditions in a fractional factorial design involving five intervention components : treatment intensity ( @ vs. @ 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 ) .