Is time restricted eating superior to continuous dietary restraint for weight management?

AbstractBackgroundThere is a significant health crisis with rates of obesity continuing to increase despite research and clinical standard behavioral weight loss programs (SBWP). Mindfulness meditation (MM), with demonstrated benefits on physical, psychological health, and self-regulation behaviors was explored with SBWP.MethodsForty-six adults (BMI=32.5±3.7 kg/m2; age=45.2±8.2 years, 87 % female, 21.7 % African American) were randomly assigned to a 6-month SBWP only (n=24) or SBWP+MM (n=22) at a university-based physical activity and weight management research center in a northeastern US city. Participants were instructed to decrease intake (1200–1500 kcal/day), increase physical activity (300 min/wk), and attend weekly SBWP or SBWP+MM sessions. SBWP+MM had the same SBWP lessons with addition of focused MM training. Outcome measures collected at 0, 3, and 6 months included: weight, Block Food Frequency Questionnaire, Eating Behavior Inventory, Eating Inventory and Paffenbarger Physical Activity Questionnaire. Data were analyzed using linear mixed modeling for efficacy analysis of weight (primary) and eating, exercise and mindfulness (secondary outcomes).ResultsRetention rate was 76.1 % (n=35). A significant group by time interaction (p=0.03) was found for weight, with weight loss favoring SBWP+MM (−6.9 kg+2.9) over SBWP (−4.1 kg+2.8). Eating behaviors (p=0.02) and dietary restraint (p=0.02) improved significantly in SBWP+MM, compared to SBWP. MM enhanced weight loss by 2.8 kg potentially through greater improvements in eating behaviors and dietary restraint.ConclusionsThese findings support further study into the use of MM strategies with overweight and obese adults. The use of this low-cost, portable strategy with standard behavioral interventions could improve weight management outcomes.

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Mechanisms of Action in a Behavioral Weight-Management Program: Latent Growth Curve Analysis

Annals of Behavioral Medicine ◽

10.1093/abm/kaab019 ◽

2021 ◽

Author(s):

Sarah Bates ◽

Paul Norman ◽

Penny Breeze ◽

Alan Brennan ◽

Amy L Ahern

Keyword(s):

Weight Loss ◽

Weight Management ◽

Dietary Restraint ◽

Self Regulation ◽

Mechanisms Of Action ◽

Management Program ◽

Habit Strength ◽

Growth Curve Analysis ◽

Weight Management Program ◽

The Impact

Abstract Background A greater understanding of the mechanisms of action of weight-management interventions is needed to inform the design of effective interventions. Purpose To investigate whether dietary restraint, habit strength, or diet self-regulation mediated the impact of a behavioral weight-management intervention on weight loss and weight loss maintenance. Methods Latent growth curve analysis (LGCA) was conducted on trial data in which adults (N = 1,267) with a body mass index (BMI) ≥28 kg/m2 were randomized to either a brief intervention (booklet on losing weight), a 12 week weight-management program or the same program for 52 weeks. LGCA estimated the trajectory of the variables over four time points (baseline and 3, 12 and 24 months) to assess whether potential mechanisms of action mediated the impact of the weight-management program on BMI. Results Participants randomized to the 12 and 52 week programs had a significantly greater decrease in BMI than the brief intervention. This direct effect became nonsignificant when dietary restraint, habit strength, and autonomous diet self-regulation were controlled for. The total indirect effect was significant for both the 12 (estimate = −1.33, standard error [SE] = 0.41, p = .001) and 52 week (estimate = −2.13, SE = 0.52, p < .001) program. Only the individual indirect effect for dietary restraint was significant for the 12 week intervention, whereas all three indirect effects were significant for the 52 week intervention. Conclusions Behavior change techniques that target dietary restraint, habit strength, and autonomous diet self-regulation should be considered when designing weight loss and weight loss maintenance interventions. Longer interventions may need to target both deliberative and automatic control processes to support successful weight management.

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