RecruitingBehavioural interventionADAPT Study: Assessing Diet, Appetite and Physiology Throughout Weight Loss Study)Behavioral weight loss programs for obesity can result in weight loss and health benefits. However, behavioral weight loss often stops despite efforts to continue losing weight, this can be called an involuntarily weight loss plateau. This study investigates changes in metabolism and/or the brain that contribute to the occurrence of an involuntary weight loss plateau.