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Does the incorporation of portion-control strategies in a behavioral program improve weight loss in a 1-year randomized controlled trial?
Int J Obes (Lond). 2017 03; 41(3):434-442.IJ

Abstract

BACKGROUND/OBJECTIVES

Controlling food portion sizes can help reduce energy intake, but the effect of different portion-control methods on weight management is not known. In a 1-year randomized trial, we tested whether the efficacy of a behavioral weight-loss program was improved by incorporating either of the two portion-control strategies instead of standard advice about eating less.

SUBJECTS/METHODS

The Portion-Control Strategies Trial included 186 women with obesity (81%) or overweight (19%). Participants were randomly assigned to one of three equally intensive behavioral programs, consisting of 19 individual sessions over 12 months. The Standard Advice Group was instructed to eat less food while making healthy choices, the Portion Selection Group was instructed to choose portions based on the energy density using tools such as food scales and the Pre-portioned Foods Group was instructed to structure meals around pre-portioned foods such as single-serving main dishes, for which some vouchers were provided. In an intention-to-treat analysis, a mixed-effects model compared weight loss trajectories across 23 measurements; at month 12, weight was measured for 151 participants (81%).

RESULTS

The trajectories showed that the Pre-portioned Foods Group initially lost weight at a greater rate than the other two groups (P=0.021), but subsequently regained weight at a greater rate (P=0.0005). As a result, weight loss did not differ significantly across groups at month 6 (mean±s.e. 5.2±0.4 kg) or month 12 (4.5±0.5 kg). After 1 year, measured weight loss averaged 6% of baseline weight. The frequency of using portion-control strategies initially differed across groups, then declined over time and converged at months 6 and 12.

CONCLUSIONS

Incorporating instruction on portion-control strategies within a 1-year behavioral program did not lead to a greater weight loss than standard advice. Using pre-portioned foods enhanced early weight loss, but this was not sustained over time. Long-term maintenance of behavioral strategies to manage portions remains a challenge.

Authors+Show Affiliations

Department of Nutritional Sciences, The Pennsylvania State University, University Park, PA, USA.Department of Nutritional Sciences, The Pennsylvania State University, University Park, PA, USA.Department of Nutritional Sciences, The Pennsylvania State University, University Park, PA, USA.Department of Nutritional Sciences, The Pennsylvania State University, University Park, PA, USA.

Pub Type(s)

Journal Article
Randomized Controlled Trial
Research Support, N.I.H., Extramural

Language

eng

PubMed ID

27899807

Citation

Rolls, B J., et al. "Does the Incorporation of Portion-control Strategies in a Behavioral Program Improve Weight Loss in a 1-year Randomized Controlled Trial?" International Journal of Obesity (2005), vol. 41, no. 3, 2017, pp. 434-442.
Rolls BJ, Roe LS, James BL, et al. Does the incorporation of portion-control strategies in a behavioral program improve weight loss in a 1-year randomized controlled trial? Int J Obes (Lond). 2017;41(3):434-442.
Rolls, B. J., Roe, L. S., James, B. L., & Sanchez, C. E. (2017). Does the incorporation of portion-control strategies in a behavioral program improve weight loss in a 1-year randomized controlled trial? International Journal of Obesity (2005), 41(3), 434-442. https://doi.org/10.1038/ijo.2016.217
Rolls BJ, et al. Does the Incorporation of Portion-control Strategies in a Behavioral Program Improve Weight Loss in a 1-year Randomized Controlled Trial. Int J Obes (Lond). 2017;41(3):434-442. PubMed PMID: 27899807.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Does the incorporation of portion-control strategies in a behavioral program improve weight loss in a 1-year randomized controlled trial? AU - Rolls,B J, AU - Roe,L S, AU - James,B L, AU - Sanchez,C E, Y1 - 2016/11/30/ PY - 2016/06/20/received PY - 2016/10/28/revised PY - 2016/11/13/accepted PY - 2016/12/3/pubmed PY - 2018/2/16/medline PY - 2016/12/1/entrez SP - 434 EP - 442 JF - International journal of obesity (2005) JO - Int J Obes (Lond) VL - 41 IS - 3 N2 - BACKGROUND/OBJECTIVES: Controlling food portion sizes can help reduce energy intake, but the effect of different portion-control methods on weight management is not known. In a 1-year randomized trial, we tested whether the efficacy of a behavioral weight-loss program was improved by incorporating either of the two portion-control strategies instead of standard advice about eating less. SUBJECTS/METHODS: The Portion-Control Strategies Trial included 186 women with obesity (81%) or overweight (19%). Participants were randomly assigned to one of three equally intensive behavioral programs, consisting of 19 individual sessions over 12 months. The Standard Advice Group was instructed to eat less food while making healthy choices, the Portion Selection Group was instructed to choose portions based on the energy density using tools such as food scales and the Pre-portioned Foods Group was instructed to structure meals around pre-portioned foods such as single-serving main dishes, for which some vouchers were provided. In an intention-to-treat analysis, a mixed-effects model compared weight loss trajectories across 23 measurements; at month 12, weight was measured for 151 participants (81%). RESULTS: The trajectories showed that the Pre-portioned Foods Group initially lost weight at a greater rate than the other two groups (P=0.021), but subsequently regained weight at a greater rate (P=0.0005). As a result, weight loss did not differ significantly across groups at month 6 (mean±s.e. 5.2±0.4 kg) or month 12 (4.5±0.5 kg). After 1 year, measured weight loss averaged 6% of baseline weight. The frequency of using portion-control strategies initially differed across groups, then declined over time and converged at months 6 and 12. CONCLUSIONS: Incorporating instruction on portion-control strategies within a 1-year behavioral program did not lead to a greater weight loss than standard advice. Using pre-portioned foods enhanced early weight loss, but this was not sustained over time. Long-term maintenance of behavioral strategies to manage portions remains a challenge. SN - 1476-5497 UR - https://www.unboundmedicine.com/medline/citation/27899807/full_citation L2 - https://doi.org/10.1038/ijo.2016.217 DB - PRIME DP - Unbound Medicine ER -