Original ResearchImpact of the LIFESTEPS Weight Management Program on Measures of Adiposity, Self-Efficacy, and Lifestyle BehaviorsWoolf, Kathleen PhD, RDN, FACSM; Heller, Jenna E. MS, RDN; Paulsen, Barbara K. MS, RDN; Bourneuf, Vicki MS, RDN; Pfaffenberger, Tracy RDN, CD; Verason, Terri MS, RDN, FANDAuthor Information Department of Nutrition and Food Studies, New York University, Steinhardt School of Culture, Education, and Human Development, New York, New York (Dr Woolf); Arizona State University Wellness, Tempe, Arizona (Ms Heller); LIFESTEPS Inc, Mishawaka, Indiana (Mss Bourneuf and Pfaffenberger); and Nutrition Education, Dairy Council of Arizona, Tempe, Arizona (Ms Verason). Correspondence: Kathleen Woolf, PhD, RDN, FACSM, Department of Nutrition and Food Studies, New York University, Steinhardt School of Culture, Education, and Human Development, 411 Lafayette St, 5th Floor, New York, NY 10003 (firstname.lastname@example.org). Barbara K. Paulsen was an original author of the LIFESTEPS program and has retired from LIFESTEPS, Inc, a nonprofit corporation. She was a manager/employee of LIFESTEPS, Inc. during the time of the study. She is currently an independent RDN consultant and none of her current activities are related to LIFESTEPS, Inc, or weight management. Tracy Pfaffenberger serves as the treasurer on the board of LIFESTEPS, Inc, and is employed by LIFESTEPS, Inc, as a coordinator. Terri Verason serves as the secretary on the board of LIFESTEPS, Inc. Vicki Bourneuf serves as chair on the board of LIFESTEPS, Inc, and is employed by LIFESTEPS, Inc, as the program manager. For the remaining authors, none were declared. Topics in Clinical Nutrition: July/September 2018 - Volume 33 - Issue 3 - p 205-218 doi: 10.1097/TIN.0000000000000144 Buy Metrics Abstract Assessment of weight loss options can help consumers and practitioners determine the best way to manage weight. This quasi-experimental study evaluated outcomes for participants (n = 1592; body mass index: 35.7±7.5 kg/m2) enrolled in the LIFESTEPS Weight Management Program. Body adiposity, self-efficacy, and lifestyle behaviors were assessed at program entry and exit. Body weight, body mass index, waist circumference, and waist-to-height ratio decreased and self-efficacy increased. More participants reported keeping food records, consuming fruits and vegetables, and participating in physical activity at program exit. Programs that emphasize nutrition, physical activity, and behavior therapy, such as LIFESTEPS, are appropriate options for weight loss. © 2018 Wolters Kluwer Health, Inc. All rights reserved.