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Weight management using a meal replacement strategy: meta and pooling analysis from six studies.
S B Heymsfield1, C A J van Mierlo, H C M van der Knaap
1Obesity Research Center, St Luke's-Roosevelt Hospital, Columbia University College of Physicians and Surgeons, New York, NY, USA. SBH2@Columbia.edu
Summary
Partial meal replacement (PMR) plans are safe and effective for long-term weight management. This strategy leads to greater weight loss and improved health outcomes compared to conventional diets.
Area of Science:
- Nutritional science and dietetics
- Obesity research and management
- Clinical trial analysis
Background:
- Millions use meal replacements for weight management, yet systematic safety and effectiveness data are lacking.
- Partial meal replacement (PMR) involves replacing one to two meals with fortified products alongside regular foods.
- Obesity is a significant public health concern requiring effective and safe long-term management strategies.
Purpose of the Study:
- To systematically assess the safety and effectiveness of partial meal replacement (PMR) plans for weight management.
- To analyze existing literature using meta- and pooling analyses of randomized controlled trials (RCTs).
- To evaluate long-term weight loss and improvements in disease risk factors associated with PMR.
Main Methods:
- Defined PMR as a low-calorie diet (800-1600 kcal/day) with 1-2 fortified meal replacements and regular foods.
- Included RCTs of ≥3 months duration in adults (≥18 years) with BMI ≥25 kg/m², excluding self-reported data.
- Conducted meta- and pooling analyses on primary data from six eligible studies comparing PMR to conventional reduced-calorie diets (RCDs).
Main Results:
- Both PMR and RCD groups achieved significant weight loss at 3 months and 1 year.
- PMR resulted in significantly greater weight loss (approx. 7-8% body weight) compared to RCD (approx. 3-7%).
- PMR showed a lower dropout rate at 1 year, with no adverse events reported for either regimen.
Conclusions:
- Partial meal replacement plans are a safe and effective strategy for achieving significant, sustainable weight loss.
- PMR interventions lead to improvements in weight-related disease risk factors.
- This systematic evaluation supports PMR as a viable option for long-term weight management.