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Published on: September 20, 2019
Twin-Based Randomized Controlled Trials in Nutritional Research: A Scoping Review
Donya Shahamati1, Jessica Nguyen1, Matthew J Landry1
1Department of Global Health & Biobehavioral Sciences, https://ror.org/04gyf1771Joe C. Wen School of Population & Public Health, University of California, Irvine, Irvine, CA, USA.
Summary
Twin randomized controlled trials (RCTs) offer a powerful method for nutrition science research. However, these co-twin dietary intervention studies are rare, highlighting a need for increased collaboration and standardized protocols.
Area of Science:
- Nutritional Science
- Human Genetics
- Clinical Trials
Background:
- Establishing causality in nutrition is challenging due to complex diets and individual variability.
- Observational studies, common in nutrition, suffer from confounding and measurement errors.
- Twin-based randomized controlled trials (RCTs), particularly co-twin designs, offer a robust solution to disentangle genetic and environmental factors.
Purpose of the Study:
- To systematically review twin RCTs in nutrition science.
- To evaluate the methodological approaches of existing twin RCTs.
- To identify research gaps and opportunities for future twin-based nutrition studies.
Main Methods:
- A comprehensive search of clinical trial registries and electronic databases was performed.
- Eligible studies included co-twin randomized dietary interventions.
- Studies were classified based on intervention type: dietary patterns, nutrients/supplements, dietary components, or behavioral/multimodal.
Main Results:
- Only 13 eligible twin RCTs were identified, indicating their rarity compared to standard designs.
- Co-twin randomized dietary interventions are underutilized in nutrition research.
- Identified interventions spanned dietary patterns, nutrient supplementation, component modification, and behavioral approaches.
Conclusions:
- The limited number of twin RCTs in nutrition may stem from recruitment difficulties and generalizability concerns.
- Increased international collaboration and standardized protocols are needed to advance twin study designs.
- Integrating emerging technologies can enhance the application and impact of twin designs in nutritional science.
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