Back to Basics? No Weight Loss from Motivational Interviewing Compared to Nutrition Psychoeducation at One‐Year Follow‐Up

• Published in: Obesity (Silver Spring, Md.) Vol. 25; no. 12; pp. 2074 - 2078
• Main Authors: Barnes, Rachel D., Ivezaj, Valentina, Martino, Steve, Pittman, Brian P., Grilo, Carlos M.
• Format: Journal Article
• Language: English
• Published: United States Blackwell Publishing Ltd 01.12.2017
• Subjects: Adult; Aged; Behavior; Bulimia; Cardiovascular disease; Clinical trials; Diabetes; Eating disorders; Exercise; Female; Follow-Up Studies; Humans; Hypertension; Internet; Intervention; Male; Metabolic syndrome; Middle Aged; Motivational Interviewing - methods; Nutrition; Obesity; Obesity - therapy; Overweight - therapy; Physical fitness; Primary care; Treatment Outcome; Weight control; Weight Loss - physiology; Womens health; Young Adult
• ISSN: 1930-7381; 1930-739X
• DOI: 10.1002/oby.21972

Objective Weight loss interventions have begun to receive increasing attention in primary care. Motivational interviewing (MI) is compatible with primary care because it requires relatively limited time and resources. Few studies, however, have examined the long‐term impact of MI for weight loss in primary care, and none have used attention‐control comparisons. This study was the first randomized controlled trial with a 12‐month follow‐up of two Web‐supported interventions: motivational interviewing and internet condition (MIC) and nutrition psychoeducation and internet condition (NPC). Methods Fifty‐nine patients with overweight or obesity, with and without binge‐eating disorder (BED), were randomized to treatments and assessed at 12‐month follow‐up after completing 3‐month treatments in primary care (15 months total). Results Mixed models examining weight loss at 12 months revealed a group and time interaction effect trend (P = 0.054; d′ = 0.57). Secondary end point analysis showed a decrease (−1.7%) versus an increase (1.3%) in weight at 12 months among NPC and MIC patients, respectively (P = 0.056; d′ = 0.57). Overall, 5 of 44 (11.4%) participants lost or maintained 5% weight losses; differences between treatments were not significant. BED status did not impact weight loss. Conclusions Two brief and scalable weight loss interventions resulted in small effect sizes for weight loss 12 months following treatment conclusion. Because MIC required significantly more resources for adequate implementation, NPC may be more cost‐effective.