This is a randomized study involving 60 study subjects (30 per arm). Investigators plan to enroll 72 subjects (36 per arm) in order to allow for any potential drop outs with the goal of 60 study completers. Investigators will compare the efficacy of inducing weight loss of two treatment arms all based on the Colorado Diet. Subjects will be randomly assigned to one of two study arms and instructed to follow the Colorado Diet by participating in weekly Colorado Diet group classes (State of Slim class). There will be 4 classes of 18 subjects each (two classes for each treatment group). Subjects will be followed in the study for 12 months. Subjects will be randomized into one of two treatment groups as follows: