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Effectiveness of a digital weight management program on diet quality: a randomized controlled trial
Ana M Palacios1, Alexandra M Lee2, Chelsie Parker3
1Department of Health Policy and Community Health, Jiann Ping Hsu College of Public Health, Georgia Southern University, Savannah, GA, United States.
The American Journal of Clinical Nutrition
|July 3, 2025
Summary
Commercial weight loss programs significantly improve diet quality and promote weight loss more effectively than standard nutritional guidance. This digital program offers a superior approach for adults seeking to manage weight and enhance their eating habits.
Area of Science:
- Obesity research
- Nutritional science
- Behavioral health
Background:
- Commercial weight programs (CP) are known to aid weight loss, but their impact on diet quality requires further investigation.
- Understanding the comparative effectiveness of digital CPs versus standard nutritional guidance (SNG) is crucial for public health.
- This study addresses the gap in knowledge regarding the dietary effects of behavioral weight management interventions.
Purpose of the Study:
- To compare the effectiveness of a digital commercial weight program (CP) against standard nutritional guidance (SNG) in improving diet quality over six months.
- To assess the impact of a digital CP on key weight loss metrics, including overall percentage of weight lost and achievement of specific weight loss milestones.
- To provide evidence-based insights into the efficacy of digital health interventions for weight management and dietary improvement.
Main Methods:
- A randomized controlled trial involving 376 US adults (BMI 27-45 kg/m²) was conducted over six months.
- Participants were assigned to either a digital CP (WeightWatchers) or SNG (monthly USDA MyPlate emails).
- Diet quality was measured using the Healthy-Eating Index (HEI-2020) via dietary recalls; weight loss was assessed as a secondary outcome.
Main Results:
- The digital CP group showed significantly greater improvements in HEI-2020 scores (mean difference 4.2 points) compared to the SNG group.
- CP participants achieved a greater mean percentage of body weight loss (-5.4%) versus SNG participants (-1.5%).
- Odds of achieving 3%, 5%, and 10% weight loss were substantially higher in the CP group (ORs 2.7, 3.3, and 7.1, respectively).
Conclusions:
- A digital commercial weight program is significantly more effective than standard nutritional guidance for enhancing diet quality.
- The commercial program also demonstrated superior efficacy in promoting substantial weight loss among adults with overweight or obesity.
- These findings support the use of digital behavioral programs for comprehensive weight management, addressing both diet and weight loss goals.
