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Rigorous control conditions diminish treatment effects in weight loss-randomized controlled trials.

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Large weight losses in control groups reduce treatment effects in weight loss studies. This meta-analysis of 239 randomized controlled trials suggests clinicians consider this when designing future weight management research.

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Area of Science:

  • Obesity research
  • Clinical trial methodology

Background:

  • The impact of substantial weight loss in control groups on treatment efficacy in weight loss (WL) or weight gain prevention (PWG) randomized controlled trials (RCTs) remains unclear.
  • Understanding this relationship is crucial for accurate interpretation of study results and effective trial design.

Purpose of the Study:

  • To investigate whether control group weight loss influences the observed treatment effects in WL/PWG RCTs.
  • To quantify the relationship between control group weight loss and treatment effect size.

Main Methods:

  • A meta-analysis was conducted on 239 WL/PWG RCTs.
  • A maximum likelihood meta-analysis framework was employed to model the association between treatment effects and control group outcomes.

Main Results:

  • An increase of 1 kg in control group weight loss was associated with an expected 0.309 kg reduction in the treatment effect (95% CI: -0.480, -0.138; P=0.00081).
  • This finding was robust to potential violations of the model's assumptions.

Conclusions:

  • Control conditions with significant weight loss can diminish the expected treatment effects in weight management studies.
  • These findings can inform clinicians in the design of future weight loss and weight gain prevention trials to improve accuracy and reliability.