This study investigated factors predicting weight loss maintenance and quality of life of bariatric surgery patients. All data were collected from 193 participants who completed the survey posted by the researcher on a bariatric surgery support Web site. Sociodemographic variables, social support, and positive post-surgical health-related behaviors were investigated as predictor sets utilizing hierarchical multiple regression. Full model hierarchical multiple regression analyses indicated that together, all variables explained 40% of variance for weight loss maintenance and 50% of variance for quality of life. Hierarchical stepwise multiple regression analyses indicated that year of surgery, gender, years of education, family's overall Support of Life Style Changes following bariatric surgery, and frequency of high-calorie food consumption were the individual independent variables most predictive of weight loss maintenance. Salary, post-surgery relationship status, general social support (i.e., family support and friend support), friends' overall Support of Life Style Changes following bariatric surgery, frequency of exercise, frequency of high-calorie food consumption, and emotional eating were the individual independent variables most predictive of quality of life. This research suggests that long-term behavioral changes are necessary to maintain the weight lost following bariatric surgery. Further research is warranted to investigate the role bariatric surgery support groups plays in maintaining the behavioral changes over time.