Research on weight-loss programs falls short
The problem? There's a lack of evidence behind commercial programs. Our team conducted an in-depth literature review and assessed a number of recent studies evaluating commercial weight-loss programs. Based on the evidence, here are three reasons why you should think twice before recommending a commercial weight-loss program for your patients:
- Studies have high risk of bias
Among dozens of randomized controlled trials (RCTs) across three meta-analyses, only one RCT had a low risk of bias—the majority had a high risk of selection, detection, and/or attrition bias. This means study participants may not have been sufficiently randomized or blinded to the intervention, and that some individuals may have abandoned the study, skewing the results. Moreover,aside from data bias, researchers noted in one meta-analysis that 21 out of 29 studies received support from the program being studied.
- There's insufficient data for analysis
Many RCTs don't have enough data to enable researchers to verify whether trial outcomes are statistically significant. For example, though one meta-analysis includes eight trials evaluating the impact of the Atkins diet on lipids, researchers didn't have sufficient data to make any claims about significance of that impact. This lack of data negates the RCTs' contribution to the evidence base behind the programs.
- Results demonstrate minimal impact on health risk factors associated with obesity
When studies were able to report on statistical significance, they overwhelmingly reported insignificant effects. Most RCTs focus on weight loss and changes in systolic and diastolic blood pressure and lipids (HDL, LDL, and total cholesterol and triglycerides) to evaluate the impact of commercial weight-loss programs. But across meta-analyses, when studies evaluate the same measures, they rarely achieve significance across all studies.
Weight management programs can work—when you take a multifaceted approach
These findings do not mean that commercial programs never work. A few studies have found that Weight Watchers and Jenny Craig—the two programs with the largest market share—can increase weight loss and improve lipid counts when compared with behavioral counseling or basic patient education. But overall, research shows that these programs can't solve the obesity crisis alone, and referring patients to them is unlikely to have a meaningful, long-term impact.
Instead, providers should take a multifaceted approach to support weight management. Combine interventions related to diet (e.g., working with a dietician, facilitating calorie counting), behavior change (e.g., providing feedback on patient progress), and physical activity. This approach not only engages patients in their weight-loss journey, but it also ingrains healthy choices into all aspects of patients' lifestyles.
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